For a smaller audiance I use magic tricks with coins:
- 4 coins to glas tumbler
- coins from hand to hand
- 7 pennies
or other coin tricks from Bobo's coinmagic.

I also use bills (torn-restored), pencils (flip-stick) and cards. If I don't have a deck of playing cards with me, I have usually a small packet trick with me or two or three card (for card warp)

I always have some rubber bands around my wrist for CMH and a ring and rubberband routine, and a star band for Star Gazer. People react well to the mismade bill routine I always have ready as well.

If you know some simple vanishes and color changes with thimbles you can carry just 2 thimbles and you have a "packs small plays big" effect. Shoot Ogawa teaches a great thimble routine in one of his videos.

I usually carry a thumb tip with me..So I can do $100 bill switch anytime. If I am just hanging with nothing around.. Borrow some coins.. 4 quarters if possible.. (I ALWAYS carry at least 1) and do a quick matrix.

At a restaurant.. Just 1 quarter and a sugar packet and I am all set to do a coin in sugar packet effect.

If I think about it.. I will put a loop or two around my wrist and carry those.