Rehearsal dinner stress

I'd probably just book another location.

I would look into other options. There's a wedding at our venue the day before ours, so we won't be having the rehearsal there. Not a huge deal considering the ceremony will still work the same way in terms of when each person walks down, it'll just be in a different setting

I would book a backup location.

Is this rehearsal dinner space included in your fee or do you pay extra? I would at least plan or book a backup. You don't need that stress! Make sure your backup allows you to cancel within 30 days, then ask for 31 days to cancel!

I am getting married in April and have this same issue. As of right now there is no wedding on the Friday before my wedding, so I am planning on doing the rehearsal at the venue. If a wedding gets booked, I have a back up plan to have the rehearsal at the hotel where I have rooms blocked off at. I think 30 days is enough time to make other arrangments, but like you said, September is a popular month so go with your gut feeling!