You can easily create a subpage on your website that will show upcoming open houses for the MLS listings that you choose. If there are no upcoming open houses the page by default will show a sign-up form.
Step 1: How to Create a Open House Subpage
Step1: After you login to your CRM and go to Website editor, create a subpage on your website with Theme Template "Open Houses"
Step2: Go to "Manage MLS Listings" section and click on "Manage" link next to the Open Houses. In the window that opens up list the MLS #'s of the listings that have an upcoming open house that you wish to show on the website.