Jen,
Congrats on your internship.
I sent out preliminary RSVP's with my STD's. I wanted to get a estimated count of how many people were thinking of coming so I could do OOT bags, luggage tags etc.... I sent out my STD the first week in January and made the RSVP date April 1st. Good news is I already got about 20 back, but there are till about 55-60 out.
KimmyG-what are you going to do about the people that didn't respond? Are you assuming they aren't coming or are you going to contact them?