If you are looking a sign in sheet for your open house events, you can download and use this open house sign in sheet template. The term of open house in this template is referred to a period of time during which a house or apartment for sale or rent is held open for public viewing. Usually these kind of events is organized by house/apartment developers for new properties, and by house/apartment brokers for used properties. By using this open house sign in template, those developers/brokers should get initial information such as name and phone number which can be followed up later. Beside those two information, you can ask them to write their address and email address.
This template below is a 4-column template where you can download and print directly. You can change column titles to accommodate other important information. For example, you might ask for their email address instead of their signatures.
If you are a sales person who stand by in that event, you should ask their name card first and give yours to prevent the expected transaction goes to other sales person, just in case there are more than one sales person who stand by in that open house events.