I had the same thing. I had a list of “must invite for family reasons” that was huge-- and mostly out of town. Then I had a list of people I wanted to invite but couldn’t (most I wanted more than most of the “musts”). Only about 1/2 of them actually said yes, but they’re all very polite, so I had a full compliments of no’s by the RSVP date. I sent out more invites. We still had some extra spots after that, so I also did a verbal “hey, come eat some free food, no gift required” like 2 weeks before the wedding at my office. One of my coworkers said she’d love to come but couldn’t because her in-laws were in town. I said bring 'em along if you want. (They’re all indian, and she said they wouldn’t find being invited to a random wedding of some coworker of their daughter in law just because they were in town particularly strange). It ended up being an awesome party.