Can't believe you missed this opportunity. Do an 8 X 11

handout from your home computers/printer announcing your next garage sale's date & address.

Arrive early and tape the invites down with some masking tape as if they were placemats.

If the hosts get upset slip them and early bird discount coupon that expires early in the day before you inevitably start to consider lowering prices or worse start migrating your junk out to the curb. Which in our town is no longer allowed without paying a tribute to yet another city revenue stream.