Ours was random. Our anniversary is in December but FI b-day, my b-day and all 3 kids have b-day close to it, so we wanted something to celebrate later in the year. We narrowed it down to June or April because we new we needed next years tax return to spend on the wedding. Then it came down to June because FI and the kids needed to be out of school. After that we just picked a date we thought "looked and sounded" good. Silly but whatever. Never thought that would be how I would choose, always wanted a fall wedding but I don't want to wait that long!