It's so great and admirable that the guy who threw the party / is in the headlining band that Chelsea likes - is so concerned and involved in the search. (Some other missing people's supposed friends and loved ones could take a cue from him, you know?)
This story resonates with me a bit, because it sounds like a party I would attend even now, at my age. And at her age, I would have definitely taken off with a cute guy who seemed "safe" for the night. I'm holding out hope that she decided to 'hang out' for a couple days with a new friend, and either didn't know people were so concerned, or feels too scared or stupid to let people know she's okay after hearing that everyone's looking for her.