My university hosts a weekend for Sibs. It's basically a time for everyone to show their little sister or brother around, give mom and dad a weekend off, and induce the student to come up with creative ways of getting their homework done before/after the weekend (or at least come up with a good excuse why it didn't get done).
My little sister came in and we had a good time. We took a five hour shopping trip (which was wonderful), played video games with my husband (well, okay, she did, I just watched), and watched what felt like a ton of movies. All in all, it was a good weekend. Too bad we have to go back to school tomorrow.