Our local Broker's tour is every Tuesday from 9:30-1:30. Some agents who host the open houses will change the hours, but it's posted in the tour sheet. To be safe, I would assume 10-noon if you were planning on stopping by.
at our weekly meeting, we schedule a group of Listing to be show on CARAVAN, with the information and a map to all the homes.
Also, your Realtor can schedule a Broker's Open House which is unique to your house: Usually scheduled during the week, Tuesday thru Thursday, afternoon or early evening; with drinks and snacks. or maybe even a catered buffet.
Talk to your Realtor. You cannot do either of these without having a Realtor!