Changing Venue

I need some advice. We’re 99.9% sure we’ll be changing our venue location because we are just not please ability to not set up the room as expected (though we were told we were) and the menu has changed since booking and the options have slimed down to things we don’t like (it is no longer customized).
We’ve looked at a new venue and fell in love with it. Just this Friday the person who had our date at the new location called to changed her date, so our date is available.
We’ve sent out save the dates but the new location only holds 200. We had 250 projected. We will have to cut down the list.
How do I handle not inviting some of the people we sent save the dates to because we have to cut down our numbers?