Rehearsal Dinner "Packets" -- Bride/groom madlibs, wedding schedule for everyone, list of phone numbers the wedding party might need the day of, etc. - I especially like the list of phone numbers idea!
Assign each table a different anniversary year (i. table 1 would be anniversary year etc.) and let the guests at that table write notes to be opened on that particular anniversary year (a unique alternative to a wedding guest book).
bachelorette party game: quiz the bride with questions about the groom (that he provides!) for each answer wrong, she takes a jello shot. for each answer right, she hands one out-the perfect bachelorette pre-drink!