If you were really punk rock, you'd put everyone on the guest list.

Oh, wait - you're using the Craigslist. No prob!

1) Opera theatres serve drinks during intermission; you'll have to find a way between now and the performance to get a job as a barback.

2) You need to make your way to the box office when nobody's looking.

3) Find the guestbook, and start scribbling!