How far ahead should the RSVP be for a bday party?

MediaBride

Working on invites and I can't decide on a date.  Party is 2/26.  

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i usually do 7-10 days before, so I have the weekend before to pick up stuff we may need and give a better count to the party place

FashionabIyLate

Ditto.  I do about a week before.