Per Diem Rate

A fixed maximum lodging rate that a government or organization allows its travelers to spend, most familiar as the U.S. federal per diem used by government and many corporate and university travelers. When an event draws attendees bound by per diem, the group rate has to be negotiated at or below that ceiling for the relevant nights, or those attendees cannot book in the block. Per diem rates vary by city and by season, which can make a compliant group rate hard to secure in expensive markets or on peak dates. For coordinators serving government, military, or per-diem-bound corporate groups, confirming the rate falls within the applicable per diem is a gating requirement, not a nice-to-have — miss it and pickup collapses as attendees book compliant rooms elsewhere.