No, YOU'RE welcome...for the excuse to have a child free evening!
Traditionally, we ask that you arrive 30 minutes before the ceremony. However, the bride and groom recommend arriving 90 minutes early to assure enough time for at least two drinks at the hotel bar.
I mean, it's a wedding, so look nice - but seriously, just wear something you can dance in. Wear that sequined number that's been in your closet for years, break out your tartan kilt! Have fun with it!