If you've been, you'll know what I mean. It wafts up from the metro and consists of: blocked drains 30 per cent. something like burnt paper, about 20 per cent.
Guests should have at least four weeks to consider the invitation before the RSVP-by date, which, in turn, is usually one to two weeks before the wedding (ask your caterers when they need a final count).
For example, we needed ours at least 30 days before the wedding, because we were arranging accommodations for everyone, and that was the last day we could cancel without a penalty. If you're just dealing with giving the caterer numbers, check with the caterer on how far in advance you'll need them. Once you've figured out when you need the numbers, set the RSVP date back a week or two from that, to give you time to call the ones who don't send back RSVPs.