Divide the players into two groups. Call one group the The Avengers and call the other group the Hydra. Give each of The Avengers a can of blue silly string. Give each of Hydra a can of yellow silly string (if this is possible).
Tell The Avengers that Hydra have developed web shooting abilities, just like that of Spider-man. Set them all loose in the party space to shoot each other with “webs.” When time is up, see which team is covered with the most prominent amount of silly string, the team with the least amount are the winners.
As the game is being played try to monitor that the kids aren’t cheating and pulling the silly string off as they play.
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