Always get the young man's name and address.
Business cards. If you're in a band, make sure you've always got some business cards because you're the only one in the band who will have. (This also applies to capos, spare leads, lighting rigs, and PA).
Make sure the hat you buy is the right size.
Fans. Get a clip-on fan to keep you cool. A hand towel is useful too.
Use a guitar stand to hold your bass, don't just prop it up unless it's a headless that's happy to be stood on end.
If you want to get ahead, get a hat.
Don't take any advice from anyone on a bass forum.