I am still waiting to hear from 55 people as of yesterday and my deadline for RSVPs is tomorrow, 5/11. I was planning on giving folks until Monday, 5/14. If I receive nothing by then, I was thinking of reaching out and saying this:
"Hi so and so, hope all is well. We haven't received your RSVP and our venue will need a guest headcount. Please let us know by 5/18/18 if you (and guest, SO, etc) can make it. We hope that you can, however, if we don't hear from you by this time, we will assume you will not be attending".
Is this too much? too little? too rude? thanks in advance!