Graduation Parties

It's a busy summer and there are lot of graduation parties going on. I was recently invited to a graduation/birthday party and now I have no idea what to get the person. Originally I was set to buy something for college, but now do I combine the gifts? Do I get one gift either college related or a simple birthday gift? I have no clue and I need your help! If anyone has suggestions of what I should do, let me know.