If you were given a plus one, it should be written on the back of your RSVP card, and it should show up when you RSVP online through this website. Due to size restrictions, we did not give many guests plus ones. If you feel very strongly that you want a plus one (especially if you are engaged or in a serious long-term relationship), reach out to either the bride or the groom and we will see what we can do.
Semi-formal :)