The offer says what was agreed. The advance confirms it will actually happen. Here is what to check, and when.
A signed offer tells you what was agreed. It does not tell you that the loading dock is on a side street, that the house PA has no monitor desk, or that the promoter who signed has handed the night to someone you have never spoken to. That is what the advance is for.
Start about two weeks out and close it the week of the show. Earlier, details are still moving. Later, there is no time to fix what you find.
Every answer goes on one dated advance sheet, sent to the promoter and the artist. Calls are for asking, not for the record. If an answer differs from the offer, raise it now, in writing. A surprise at settlement is a dispute. A change flagged in the advance is a conversation.
On KONNOVA the accepted offer already holds the date, load-in, set length, the money, technical and hospitality lines and cancellation terms, with both parties named. The advance confirms those details instead of rebuilding them from a DM thread. Deposits and settlement stay between you and the promoter: KONNOVA never holds funds.