Annoyed.......what would you do?

Did you give them an "I need to know by" date when you did your follow up calls? Something like "if I don't hear from you by (insert date), then I will mark you down as a no." But obviously in nicer wording. If so, then it's definitely safe to assume they aren't coming and move on...you've done all you can do. If not, then I'd reach out one last time and let it be known that it's your last attempt and if you don't hear from them by (insert date), you will mark them as unable to attend.

I would mark them as no's, but I would let them know so that they don't show up unannounced. "Our final head count is due this evening. Since I have not received your RSVP or heard back from my previous text, we will assume you're unable to attend."

I would send one more message, something like, "Hey! Just following up one more time. We have not recieved your RSVP and our numbers are due. If I don't hear from you by the end of the day today I will have to mark you as a "decline"."

I wouldn't send them anything else at this point. I would mark them as a "no". If they contact you, you can let them know since you did not receive a response you assumed it was no and you have given your final headcount. Otherwise, keep it moving and look forward to your day.

Like some of the PPs, I'd contact them one more time with a hard deadline, mentioning needing final headcounts if necessary, and if they still don't respond, it's a No.

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This is a good final wording! I don't understand how people don't get that they have to respond. If they feel bad about saying no they should've just sent the rsvp back in a timely manner and it would feel less awkward then via text.

I would keep trying a little bit more and if they still don't then yes I would mark them as no shows. Sorry this happens! It's so annoying. It's like why do I have to chase you down for an answer -_-

They've already missed the RSVP deadline. If you've followed up with them and they're not answering, mark them as a "no".
They're clearly not taking it seriously and you shouldn't have to practically beg someone to RSVP.

I dealt with the same thing and it was so annoying. I sent them all a text with the final headcount date and told them if I didn’t hear back from them I would put them down as a “no”. You have enough to deal with that you shouldn’t have to chase people.