Holly shit I do not know how you managed to read my message. I had auto correct set to Spanish.

I was picturing something realtime. You get an app where you can type your +1 and you get a list of all the guests. You tap someone you get to -1 them. At any point you might get a notification hat you have been -1'd and you can go +1 yourself and bring no one. If you are not +1ing your self then your +1 can get -1'd in which case you can't invite someone else (I'd love to make it so that you can change your +1 to someone else but then the other person might change their -1 to the new person and it turn into a cycle, or -1 are permanent and prone to abuse)

As a fun option you can sell your -1 if you don't plan on using it

If you self vote, you don't get to bring anyone. Even with self voting you can get -1'd twice. Otherwise you can +1 your date, the you get -1'd and your date goes alone. Which has a high likelihood of meaning that they won't go either

Nah, convert all subtractions to adding negatives and compute concurrently.