Some people aren't Rsvping for my wedding

A lot of people wait til the last minute or some past the deadline. My coworkers all waited last minute too. It's such a common and annoying thing for people to be late at rsvp'ing or not rsvp'ing at all. I would usually give it some more time past the RSVP date and then reach out again and emphasize you need a final count

Once that date has passed, reach out and say "our RSVP deadline was Friday and I noticed we didn't receive yours. Our final head count is due on x date. If we don't hear from you by then, we will assume that you're unable to attend."

Yes, unfortunately, most people do not understand the importance of an RSVP for a wedding. They treat it like any other party, where RSVPs are not so strict. But for weddings, you need to give your caterer/venue an accurate head count, and usually the amount the bride and groom are responsible for is directly tied to the head count. So, you need to spell it out for them, as PPs have said above. We haven't received your RSVP, and our head count is due XX date. If we don't hear from you by then, we'll count you as a "no."

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Exactly what Caytlyn said.

Remember too, if they send it back on Friday - the due date - it will take a few days to arrive in the mail.