Slippage in Hotel RFPs (Plain English Definition + Examples)

Definition

Slippage is the percentage of contracted group block rooms that go unsold — calculated as (block size minus actual pickup) divided by block size. If you contracted 100 rooms and 78 were picked up, slippage is 22%. The attrition allowance cushions slippage; anything above it triggers penalties.

In day-to-day European event sourcing, slippage sits inside a broader workflow that includes the brief, the longlist, the shortlist, the contract negotiation, and the post-event reconciliation. Understanding it in isolation is not enough — what matters is how it interacts with the other levers a planner can pull. The definition above is the textbook version; the sections below explain how it actually behaves in real RFPs.

Why Slippage matters

Slippage is the operational mirror of attrition. Tracking historical slippage by event type, audience, and lead time is how planners size future blocks correctly. Median European corporate slippage 2024-2025: 16-22%. Plan to that, not to attendance forecasts.

The practical takeaway: planners and procurement teams who get slippage right typically see measurable improvements in either cost, risk exposure, or cycle time — sometimes all three. Teams who default to the supplier's standard language usually leave 5-15% of total event value on the table, often without realizing it. The skill is recognizing slippage when it appears, knowing the market-standard range, and treating any deviation from that range as a negotiation point — not a take-it-or-leave-it.

Example

A SaaS company's user conference history: 2023 slippage 18%, 2024 slippage 24% (post-pandemic uncertainty), 2025 slippage 16% (in-person rebound). For the 2026 event with 450 expected attendees, the team blocks 320 rooms (not 400) to keep slippage within the 20% attrition allowance even in a soft year.

This example is representative of mid-to-large European corporate MICE — pharma, finance, tech, professional services. Smaller events (under 50 attendees) and very large events (1,000+) often follow different conventions, but the underlying logic of slippage stays the same. The numbers move, the principle doesn't.

Where Slippage appears in contracts

Slippage is calculated at event close-out from the final pickup report. It's the input to next year's block-sizing model.

When reviewing a hotel proposal or contract draft, scan for slippage early — it's often easier to negotiate before the supplier has anchored on their preferred position. Easy RFP surfaces these terms in every comparison view so planners can spot deviations from market-standard ranges at a glance, rather than reading 14-page proposals line by line.

Related terms

Deeper reading