The reply-by date usually sits three to four weeks before the wedding, because that's when the caterer, the venue and the seating plan start asking for numbers. Plan your reminders around that date, not the wedding day:
- About a week before the reply-by date: a gentle nudge, sent only to people who haven't answered.
- On the reply-by date or a day or two after it: a clear final call.
- The next few days: a phone call to anyone still silent.
- Then: final numbers to the caterer.
The week-before nudge does most of the work. It arrives while guests still have time to check work shifts, sort out childcare or look at travel, and it doesn't feel like chasing because the deadline hasn't passed yet. Don't send it much earlier: a reminder three weeks ahead of the deadline tends to get a cheerful “will do!” and then nothing. If the invitations haven't gone out yet, check when to send your wedding invitations so there's room for all of this.
