If this is an NCAA visit they are not CVW weekends. These are different. They can be done during anytime the NCAA allows them. They are also longer than a typical CVW. Their host will be a member of the crew team. Depending on the budget it might include flying parents out too, dinners out in town, etc. of this is what crew is offering you would need to ask them what a typical visit is like.
And agree there should be an agenda. Even many moons ago when I went I got an agenda. The visit also gets registered as one of your official visits as they are limited by NCAA rules.