If you looking for something to do this weekend, a second choice (after the lake) could be the CopperState Regional Fly-in. Saturday is usually the most impressive day, as planes from all around the western U.S. come to this event to show off their experimental aircraft.
There are air shows and vendors areas. This is something every kid old and young) should see in their life time. Grab the kids and get there early saturday, for an unbelievible time.
Here is the link with all the details