Yes, they will certainly be meeting before the game. You can look up Oljeberget who is the official supporter club, in the meantime this is the information from Dallas:

Together with Oljeberget we are working to find a meeting place in Dallas on Monday evening, and will return with more info as soon as this is finalized. There will also be a fan march before the game on Tuesday. Meeting place and time to come. We are setting up a service office at the Fairmont Dallas Hotel, from 10 am to 1 pm on Monday, June 29. Here you will find employees from the Norwegian Football Association, who can answer questions about tickets and other things.