As you've learned, a good habit to get into is to check your clutch after every song.

Sucks about the bass amp. I like to watch my hi-hat extra carefully, just in case, so that I may be able to play by myself if I have to.
Also, if you've the space and resources, it's not a bad idea to carry spare picks, cables, strings, etc. for your guitarists/bassists, because Murphy's Law will say that they'll forget 'em.

Just don't clue them in to your possession of these articles, as they'll come to depend on you.