The Swarm has a tailgate at the top of the hotel on the south side of Melrose outside Kinnick. They don't ID or ask if member. You have to purchase your food and drink, but you may like that. Otherwise just general south side of Kinnick along Melrose. Plenty of food and merch vendors there pregame.
After the game if you hang out by the Kinnick statue on the south side of the stadium, the players all come out there if you want to see anyone or try to get an autograph. Coaches usually head back over to the football building after game and interviews are done.