When should you RSVP by for a wedding?

The invitation will include an RSVP date, and that is the date you must stick to. Couples need final numbers for the venue, the caterer and the seating plan, often a few weeks ahead. If you reply late, you risk the couple not having a seat or a meal for you. If you have not received an invitation but know the wedding date, do not assume you are invited. Wait for the invitation to arrive. If you cannot attend, reply promptly with a polite no. If you can attend, reply promptly too, and include any dietary requirements or accessibility needs. If your circumstances change after you have replied, tell the couple as soon as possible. It is far better to be honest than to let them plan for a guest who will not come. A quick message or call is fine, but do not leave it until the week before. The RSVP is not just a formality, it is a promise that the couple can rely on.