Getting the booth inventory mix right before you open sales on a new hall

The first draft of the new hall plan lands in your inbox in October. It has 34 island positions, a long run of 20 by 20 blocks down the middle, and 96 units of 10 by 10 stock tucked along one wall.

Last edition that show had 372 exhibitors buying 100 square feet.

Somebody has optimised the plan for revenue per square foot, which is a sensible thing to optimise, and has produced a floor that roughly two thirds of your current exhibitor base cannot buy from. The booth inventory mix on that drawing has already settled who is allowed to be a customer, and the plan opens for selection in three weeks.

The map decides who is allowed to be a customer

A floorplan is an inventory decision dressed as a drawing. Every block on it is a shape somebody can write a contract against, and a shape that is not on the map cannot be bought at any price.

That makes the mix the most consequential commercial decision in the space cycle, and it is usually made by whoever is best at the floorplan software, working from last year's map plus whatever the sales director mentioned in a corridor. The rate card gets three meetings. The mix gets none.

The reason it matters more than it looks is that booth size is a proxy for the kind of company an exhibitor is. Your 100 square foot stock is where regional distributors, new entrants, single-product manufacturers and the whole long tail of your category live. Your island stock is thirty accounts you already know by name. Change the ratio and you have changed which industry you are running a show for.

How do you build the mix from contract history?

The input is one query against your contract table: exhibitor, edition, booth number, net square feet. Group by size band, count contracts, sum area, and compute both shares.

A real-shaped example. Six hundred exhibitors, 154,000 net square feet sold across six bands.

At 100 square feet, 372 contracts holding 37,200 square feet. That is 62.0 per cent of your exhibitors and 24.2 per cent of your space. At 200 square feet, 118 contracts holding 23,600. At 400, 62 contracts holding 24,800. At 800, 30 contracts holding 24,000. At 1,600, 12 contracts holding 19,200. Above that, six accounts holding 25,200 between them, 16.4 per cent of the floor in six signatures.

Two numbers jump out of that table and they point in opposite directions. Six accounts hold a sixth of the hall, which is concentration risk worth naming. And 372 accounts, the ones nobody in sales spends time on, hold a quarter of it and produce most of the exhibitor count that the show is measured on.

Do this for three editions, not one. The band-level counts drift slowly and the drift is the interesting part. If 100 square foot contracts fell from 410 to 372 over three editions while total space held flat, you have a base eroding under a stable headline, and the mix on next year's map should be sized against where the trend is going rather than where last year landed.

What does cutting small stock actually cost?

Return to the October plan. Suppose the proposal is to halve the 100 square foot inventory, from 372 positions to 186, and convert the released area into island blocks. Small booths generally carry the highest rate per square foot, which is how a size ladder is built and F4's subject, so on paper the trade looks bad and gets made anyway, because islands are easier to sell and the sales team has thirty relationships that want them.

Work it through. Removing 186 units of 100 square feet releases 18,600 square feet. Islands need an aisle on all four sides, so converting a run of back-to-back inline blocks into islands consumes additional circulation. Assume the conversion yields 15,800 square feet of sellable island inventory once the extra aisle is taken out.

At an inline rate of 36 dollars and an island rate of 30, the 186 small contracts were worth 186 times 100 times 36, which is 669,600 dollars. The new island inventory is worth 15,800 times 30, which is 474,000. The trade gives up 195,600 dollars of space revenue in exchange for a floor that is easier to sell.

It also gives up 186 exhibitors, which is 31 per cent of the exhibitor count. That number goes in the post-show report, into the media pack, and into every attendee's decision about whether the show is still worth a flight.

The sector context makes this worse. The CEIR Q2 2025 Index, published in September 2025, put exhibiting companies 8.8 per cent below Q2 2019 while net square feet sold sat 4.9 per cent below. Exhibitor count is the metric already furthest behind across US B2B exhibitions, and a mix decision that trades count for area is pushing on the one that is already weakest.

There is a slower cost as well. The six accounts holding 25,200 square feet did not arrive at that size. Some of them started at 100 square feet six editions ago, and the pipeline that produced them is the small stock somebody is proposing to halve. Cutting the entry tier is a decision whose cost lands two show directors later.

Small exhibitors are buying a predictable total

The other half of the mix question is whether the small stock you keep is buyable at all, which is a question about the total cost rather than the space rate.

Freeman's exhibitor trends report, "Event Excellence by Design", published in April 2024 from a survey of 1,911 exhibitors fielded that February, found 64 per cent naming turnkey all-inclusive exhibit packages as the most important form of assistance an organiser can provide, and 61 per cent saying unpredictable total cost has a major influence on their exhibiting experience.

For an account spending 3,600 dollars on space, a 700 dollar material handling bill that arrives after the show is a 19 per cent overrun on a budget that was signed off by someone with no authority to approve more. That is how a 100 square foot exhibitor becomes a non-returner, and it will not show up in any conversation your sales team has, because nobody calls the sales director to complain about a drayage invoice.

Whether to answer that with a bundled package, and what to charge for it, is F33's argument. The mix consequence is narrower: if your entry tier is priced and packaged in a way that produces bill shock, holding 372 small positions on the map will not keep 372 small exhibitors, and the mix you designed is not the mix you will sell.

Convertible blocks, decided late

The practical way to stop guessing is to design part of the plan so the decision can be made after demand appears.

Lay out a set of blocks that can be sold either as four 10 by 10 units or as one 20 by 20 island, with the aisle structure drawn so both readings work, which is one of the few places where the wider drawing in F17 and the mix decision have to be solved together. Hold them out of the initial release. As the selection process runs and you see which shape is filling, commit them one way or the other in batches.

Twenty convertible blocks on a 154,000 square foot floor is 8,000 square feet of optionality, about 5 per cent of the hall, and it converts a decision made in October from a forecast into a measurement taken in February. The cost is a slightly less tidy map and some discipline about not releasing the reserve early when a large account asks.

Two rules make it work. Publish the reserve as a reserve, so nobody discovers it and assumes the show is undersold. And set the decision date in advance, because a convertible block that stays convertible until April is a block that sells in neither shape.

The targets worth holding

Three constraints, expressed as ratios, will keep most plans honest.

Hold entry tier positions at least at last edition's contract count, adjusted for the three edition trend, before any conversion is considered. Hold island positions to no more than the number of accounts that bought islands last edition plus the named waitlist, because unsold island stock is the most expensive empty space on any floor. And keep the share of space held by your five largest accounts visible on the same page as the mix, where the rest of your exhibitor analytics can reach it, because a plan that quietly concentrates the floor is a plan that raises your renewal risk without anyone deciding to.

Where this stops

A mix built from last edition's contracts assumes next edition's demand resembles last edition's demand at the band level. That holds for a mature show in a stable sector and fails badly for a show that has just moved city, changed dates, absorbed a competitor, or opened a new category. In those cases the demand distribution you are copying belongs to a different show and the convertible reserve should be a much larger share of the plan, closer to 15 per cent, with the entry tier deliberately overbuilt because small stock that goes unsold costs less per square foot than an empty island.

The deeper limit is that contract history tells you what people bought, and what people bought was constrained by what was on the map. If your last three plans have all been short of 400 square foot stock, your history will show weak demand at 400 square feet, and you will keep building the same plan. Waitlist and rejected-request data is the only thing that breaks that loop, and most organisers do not keep it in a form that can be counted, which is F25's subject.

Start by running the size band table for your last three editions of one show. If the count of contracts in your smallest band has fallen while total space held flat, you are already living through the trade described above, and nobody made the decision on purpose.