Organizers use room block and group rate interchangeably, and hotels do not correct them, because the difference is the whole risk of the deal. A group rate is a price. A room block is a promise. Only one of them can send you an invoice.
The group rate
A negotiated rate for your attendees, usually behind a booking code or link. If nobody uses it, nothing happens — you lose face, not money. Rates without held inventory are the hotel marketing to your audience through you, and they are essentially free to offer.
The room block
Held inventory plus a rate plus, almost always, an attrition clause guaranteeing the hotel a percentage of the revenue. This is where empty rooms become your cost. The clause is the price of the hold: the hotel took rooms off the market for you, and it wants paying whether your forecast was right or not.
Which one you actually need
- Small or uncertain events: a courtesy block — held rooms, no guarantee — or a bare group rate. No clause, no risk.
- Established events with proven pickup history: a contracted block sized off last year's actuals, not this year's hopes.
- Any event: never guarantee inventory to look serious. Hotels respect a well-sized ask more than a big one.
The tell in the paperwork is the word guarantee, or a percentage anywhere near the room count. If you see either, you are signing a block, and everything about attrition thresholds, cutoff dates, and resell credits now applies to you.
One more distinction worth holding onto: neither structure captures the attendees who book outside it — and in the event market we measured, the outside was the majority, with roughly 70% of lodging dollars moving in the final 30 days. The rate serves your early bookers, the block serves the hotel, and the late majority serves whichever booking site got there first. That last group is the one an always-on offer at your checkout is built for.
Reading the paperwork for the tell
The distinction hides in specific words. If the document says courtesy, held until, or rate available until — with no percentage and no guarantee language — you are looking at held inventory or a rate, and your risk is zero. If it says guarantee, attrition, pickup requirement, or names a percentage of the block, you are signing a purchase commitment. Sales materials blur this deliberately; the contract cannot. Read the contract, not the proposal, and search it for the words attrition and guarantee before anything else.
A practical rule for choosing: sign guarantees only against demand you can prove — last year's pickup report, this year's registration curve. Everything speculative belongs in courtesy holds and rates, which cost nothing when the speculation misses. First-year events, new markets, and new dates are all speculative by definition, whatever the enthusiasm around them says.
The three-question decision
- Can I document the pickup this block assumes? If not, courtesy block or rate only.
- Would the worst-case attrition bill hurt? If yes, shrink the guaranteed portion until it would not.
- Does the structure serve the attendees who will not use it? If the answer is nobody-handles-them, add the open-market layer before signing anything.