How to ask people to rsvp

“Hi there! I noticed that we haven’t received your RSVP yet. Our final headcount is due soon. If we don’t receive your RSVP by Saturday, we will assume you can’t attend.”

On Friday I'd start reaching out via text, Facebook, email or phone call and just say "Hey! Our RSVP date was wednesday so we are just asking for RSVPs now so we can get a final head count for food and liquor and venue. Hope you can make it. Thanks!"

I would wait until the day after tomorrow to reach out to the guests who haven't responded like you said.

I shamed my unresponsive guests via text lol. I sent texts along the lines of... "I'm not mentioning any names but SOMEONE hasn't responded to our wedding invite!" All responded right back to me. Of course this obviously isn't appropriate for everyone, but I'd just reach out via text or phone call and tell them you need their responses NOW because your caterer needs a headcount.

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THIS. Give them a chance to RSVP, but also a hard deadline (ideally before your headcount is actually due just in case someone comes in extra late) so that they have fair warning that there won't be space if they're late again.

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Ditto. Also the "if we haven't heard from you by ___ we'll assume you declined and can't accommodate you at the wedding" gives them an easy out - they don't have to respond for you to hear no. IDK why, but some people feel bad about saying "no".

People suck at RSVPing, and I've unfortunately have heard of this happening a lot from other brides. My advice is to wait a few days after your deadline, then reach out to everyone individually. You can even enlist the help of your mom & FMIL with family members. The reason I say to give it a few days after, is because some people will literally wait until the deadline to send theirs back. You can say something like "Hey, I'm reaching out because our RSVP deadline has passed, and we did not receive yours. Hope all is well, but we need to know whether you will be joyfully attending or celebrating from afar for our final count. Look forward to hearing from you, thank you." IF they still don't respond after that, then count them as a "no." Good Luck!

I say give it until the weekend, because you know, mail... If you don't hear from anyone by Monday start dropping some hints to your procrastinators.