<human>: We worked on our guest list for months, we got it down to the maximum amount of people allowed at our venue (150 guests). I have some serious invite-regret, in that I think we invited too many people who are from our past but aren't really involved in our present lives anymore.

We're in our early 20's (FH is 24, I'm 23). We have a lot of high school and college friends which we wanted to invite to the wedding, as they were a large part of our lives. We've all moved across the state and scattered, but having them at my wedding (especially the reception) is something we both wanted.

Now......we're getting tons of questions from these 20 somethings about bringing a date. We invited +1s for our friends in seriously committed relationships (read: dating for at least 6 months when the STDs went out a few months ago). The last person who asked is not dating anyone, and is not even close with me, he's only FH's friend. I'm so nervous that the rest of our 20 something guests are going to feel the same way and try to bring +1s. Our ceremony venue can't handle that. That's like, potentially 50 more people... also read: 50 more strangers!!! at my wedding. That seems absolutely crazy to me.

We already sent out STDs, so now I feel like we screwed up. Can we simply write in the person's name on the RSVP response card so they get that there are no +1s for them? I specifically invited groups of friends so that nobody would feel out of place, but unless we have a serious amount of people decline to attend the wedding, the ceremony venue cannot handle +1s. And frankly, I don't think I would have invited that many people from our past had I known they wanted to bring a random date, it's just not something I envisioned or want. 

What to do?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Sent out Save the Dates to individual people, they want to bring plus ones, ceremony venue can't fit them. Screwed up, help!