We've actually tried moving away from themes, as we don't have a huge recruitment budget, and each themed party, with little decoration and no "fancy" food, ends up looking more pathetic than anything.
One "theme" the girls are going to do this semester though is a Green and Gold party. Everyone will dress in Green and Gold (or yellow), and all of the food will be green and gold as well (veggie dip with cucumbers and green and yellow peppers, green and yellow candy, green hi-c or hawaiian punch and apple juice, etc). If they split into teams for a game or activitiy they'll have the Green team and Gold team, blah blah blah. It makes it a theme without having to try and go all out and spend a lot of money.
We usually have an info night, which is planned very well and shows the same things that you mentioned... but again, it's getting girls to come to these kind of events that's difficult.
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