Activity for Keara

So my day is quickly approaching and I have majority of the big day planned out and now just have little stuff like printing seating chart, programs, and buying little accessories for decor. The only thing I'm having issues with is I got 118 chair...

My diy cake stand: 16"mirror, 16"dummy cake and 16"board and diamond mesh wrap

Do you guys think it is a good idea to just let guest rsvp online instead of mailing them back?