doublewise – What would you do in the landlord’s situation ?
I do think four consecutive weekends of open house is excessive. But, I wouldn’t go out of my way to make life miserable for the landlord. Why not ask for a discount in rent in exchange for allowing a limited number of showings with at least 24 hours notice. e.g. – showings only after an accepted offer. This is quite common for tenant-occupied property.
If I were the owner I would let you out of your lease.
I would try to work with them after they realize they can’t bully you around.