Short answer
Yes, it is correct, though 'RSVP' already means 'please reply'. Saying 'please RSVP' is common and polite in the UK. You can also write 'Kindly reply by 1 May' or 'Please respond by 1 May' to avoid repetition.
In everyday British English, 'please RSVP' is widely accepted and understood. The letters stand for a French phrase that means 'please respond', so strictly speaking you are saying 'please please respond'. But this is not a grammar error in modern usage, and most guests will not notice or mind.
If you prefer a cleaner wording, use 'Please reply by [date]' or 'Kindly respond by [date]'. These are equally polite and very clear. You can also add a line like 'We would be grateful for your reply by 1 May so we can confirm numbers with our venue.'
On printed invitations, it is fine to write 'RSVP' on its own, but always include a date. Without a date, guests may forget or assume they can reply later. If you are using a wedding website or e-invite, you can say 'Please RSVP online by [date]' and include a link or QR code.
For a more formal tone, write 'The favour of a reply is requested by [date]'. This is traditional and still used, but it may feel old-fashioned to some guests. Choose the wording that matches your stationery style and your own voice.
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Wedding printThank-you cardsfrom £42.34Folded thank-you cards with your favourite photo from the day on the front.Design it online → Answers from couples and guests
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