How to say gentle reminder politely?

The key is to acknowledge that people are busy and that you are not annoyed. Start with "I hope you are well" or "No rush at all, but..." Then say something like "Just a gentle nudge about the RSVP" or "A quick reminder that we would love your reply by [date]." You can add "We completely understand if you are still deciding." This shows empathy. Then give the practical details: how to reply, whether by card, website, or message. End with "Thank you so much for letting us know" or "We are really looking forward to celebrating with you." Avoid words like "overdue" or "must" as they sound harsh. Instead use "when you have a moment" or "at your earliest convenience." If you are writing to a guest individually, you can be more personal: "We noticed we have not heard from you yet, and we just wanted to check in." That feels caring, not demanding. Remember that some guests may have lost the invitation or forgotten the date, so a gentle reminder is genuinely helpful.