As for the gift, I haven't a clue. For the surprise, however, you need to surprise her in a way, or in a place, she won't expect. Like, say, lure her onto a bus at a certain stop, but arrange for all her friends to have gotten on at a previous stop. So they're all hiding under hats and behind newspapers and you two get on and, voila, party time -- within limits. And I assume the bus will take you all someplace where you want to go for extended merriment.
And if that isn't suitable, something similar. Spring the surprise in some public place, preferably away from campus, where her guard is completely down, and from there travel to the nearby place where you all actually plan to party.
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