September 11, 2026
Hotel and event terminology: the words on a BEO
A working glossary of hotel and event terms, organised by where each bites: contract, room, food, schedule and production. Definitions plus the failure mode.
Most hospitality glossaries tell you what a word means. That is rarely the problem. The problem is that two people read the same word on the same document and picture different things, and nobody finds out until the trucks arrive. I’m Daniel Pitner, Director of Sales at EventDiagram, twelve-plus years in the event industry, and this glossary is organised the way the day is — contract, room, food, schedule, production — with the failure mode attached to each term rather than just the definition. Current as of September 11, 2026.
The contract
| Term | What it means | Where it bites |
|---|---|---|
| Room block | Guest rooms held for a group at an agreed rate | Held ≠ paid. Unsold rooms fall back to the hotel at the cut-off date |
| Attrition | The share of a block you may fail to sell without penalty | The single most expensive clause in group contracts. 80% attrition means you owe on the other 20% whether or not anyone slept there |
| Cut-off date | When unbooked rooms release back to general inventory | Usually 30 days out. Attendees who book late pay rack rate and blame the planner |
| F&B minimum | The food and beverage spend you commit to | Whether service charge and tax count toward it is negotiable and frequently assumed. Ask |
| Service charge vs gratuity | A mandatory percentage to the house vs a tip to staff | They are not the same and often both appear. Service charge is usually taxable |
| Comp ratio | Free rooms earned per rooms sold, e.g. 1 per 40 | Cumulative or per night changes the value materially |
| Force majeure | Events excusing performance by either side | Post-2020 language varies wildly. Read it; the boilerplate is no longer boilerplate |
| SMERF | Social, Military, Educational, Religious, Fraternal group business | A rate segment, not a discount. Detail in what SMERF means |
The room
| Term | What it means | Where it bites |
|---|---|---|
| Airwall | A movable partition dividing a ballroom into sections | Sections are rarely equal, and an airwall is not soundproof. Never programme a quiet session next to a band |
| Set / room set | How the furniture is arranged | “Rounds of 10” and “rounds” are different orders |
| Turn / reset | Changing a room from one set to another mid-event | Labour and a hard deadline. Price it and time it in advance, always |
| Capacity chart | The published maximum per room, per set | A maximum with nothing else in the room — no stage, no dance floor, no buffet |
| 24-hour hold | The room is yours overnight, so the set survives | Without it you may be struck and reset, at your cost |
| Prefunction | The circulation space outside a ballroom | Where registration, coffee and the cocktail hour actually happen. Ask its dimensions too |
| Back of house (BOH) / front of house (FOH) | Service areas vs guest areas | The service route from kitchen to room is the thing to check, not the label |
| Rigging points | Certified ceiling points for hanging load | Finite, often charged per point, and sometimes already spoken for by the group before you |
The set names carry real numbers behind them. In one 50 by 80 foot room I measured theater at 360, classroom at 150, banquet rounds at 120 and cabaret at 90 — the same four walls, a four-to-one spread. If a set style is written on a contract without a seat count next to it, that is the ambiguity to close first. All ten sets are drawn to scale in event seating styles.
The food
| Term | What it means | Where it bites |
|---|---|---|
| BEO (banquet event order) | The operational document for one function | The room set on the BEO and the floor plan disagree more often than anyone admits. Full guide and template |
| Guarantee | The headcount you commit to pay for | Due 72 hours out, and it can go up but not down |
| Set over / overset | Places laid above the guarantee, typically 3–5% | Confirm whether you are charged for them if they are used |
| Plated vs buffet vs family style vs stations | Service formats | Each has a different floor cost and a different service-aisle need |
| Butlered | Passed by staff rather than set out | Labour-heavy; consumption is harder to predict than a station |
| Consumption vs package bar | Pay for what is poured vs a per-person rate | Consumption wins for light drinkers and short events, package for the reverse |
| Corkage | Fee to serve alcohol you supplied | Often makes “bringing your own” cost more than buying theirs |
| Refresh | Restocking a break station mid-session | Costs labour and interrupts the room if the timing is not on the run of show |
The schedule
| Term | What it means | Where it bites |
|---|---|---|
| Load-in / load-out | Getting production in and out of the building | Dock access, lift dimensions and union rules decide the real timeline, not the truck |
| Run of show | The minute-by-minute schedule | The only document where AV, catering and the client have to agree on the same timing |
| Call time | When crew are required on site | Distinct from load-in start, and often the thing that triggers overtime |
| Dark day | A held day with no function in the room | Usually charged. Often the cheapest insurance you can buy for a complex set |
| Strike | Breaking the room down | Someone is paying for it at 1am. Establish who at contract, not on the night |
Production and AV
| Term | What it means | Where it bites |
|---|---|---|
| Throw distance | Projector-to-screen distance for a given image size | Decides where the first row can be. Plan it before the seat count |
| Sightline | Whether a seat can actually see the screen or stage | The bottom of a screen should sit at least 4–5 ft off the floor or the back half sees heads |
| Riser vs deck vs stage | Platform sections, usually 4×8 ft, at a set height | Height changes the sightline and whether you need steps and a rail |
| Uplight / wash / gobo | Fixture up a wall, broad colour, projected pattern | All need power and cable paths that do not cross a guest route |
| Distro | Power distribution from the house supply | Amperage and drop locations are a floor plan question, not an electrical one |
| House sound / patch | Using the venue’s installed system, or feeding into it | “There’s a sound system” can mean anything from a line array to ceiling speakers |
Two words worth settling before anything else
If you only align on two terms with a venue, make them these:
- Capacity. Always ask “in which set, and with the stage and dance floor in?” A published capacity and a usable capacity routinely differ by a third or more, because the chart assumes an empty room with the biggest tables at the most chairs.
- The set. Get it written with the table size and the chair count — “60-inch rounds of 8” and not “banquet” — and get a floor plan attached. Every set argument I have ever watched came from a set described in one word.
Where we obviously stand
We build EventDiagram, so read this accordingly. The glossary is a glossary and needs nothing from us. The recurring theme in it, though, is one thing: almost every failure mode above is two parties reading one sentence differently, and a to-scale plan attached to the BEO closes most of them, because a drawing cannot be ambiguous about where the tables go. That is on the free plan.
Related: the room sets themselves in event seating styles, the document these words end up on in the BEO guide, the segment in what SMERF means, and how a full room comes together in event venue layout.
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