For your Baseball party theme, here is a game idea that can be altered to fit the Baseball party theme.
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Party Games for more free party games. P e a n u t s get your peanuts, catch, pow, it's a baseball party.
PANTOMIME: There are 2 teams in this game. One team asks the riddle for the other one. The riddle is a pantomime. The team may give as many answers as there are the players in the team. The team which asks the riddle may offer only abstract notions, e.g. "youth" : all the players in the team are holding each other by the hands and looking in the sky smiling. The other team may give the following variants: happiness, inspiration, growth, childhood. About the last variant the first team may say that this variant is close to the right answer.