My favorite was spring break, sexy events make for sexy girls. Loved valentine's day as well and I agree with DrQuatsch: I don't know who drew her, but val red battler has hands down the best art in the game. Her shading is on a whole other level, though the other events girls are also quite an improvement over the base characters.

Honorable mention for geekette but I'm a weak boob man and you know how to please us ><