My FMIL really wants to add the rehearsal dinner invite into the wedding invitation envelopes so that it's "more efficient". I'm not so sure I like that idea. My wedding invites are all planned/almost done and I just don't like the idea of adding another sheet of paper loose in the envelope. Everytime I've been invited to a rehearsal dinner I've gotten a seperate invite a few weeks after the wedding invitation arrived.What did you guys do or what do you plan to do? Is there etiquette on this?