I'm wondering how far in advance you booked your reception venue? What month and day of the week is your wedding on?
Are you inviting guests with plus ones? We haven't gotten our guest list down yet but I feel like it is polite to give people the option to bring guests but am wondering how much that will affect the total guest count (i.e. if a handful of people RSVP as a single instead of with a guest).
Edit: How many venues did you look at in person before you booked one?