craft fair stuff, random feature

I'm pretty proud of how much I've accomplished already for the Iowa Arts Festival. There is still a lot to do, but I'm making progress. As I've been working on everything this week, I've thought of a couple more things that I'd appreciate feedback on.
The first one is how much change do you like to bring? I've been reading various advice and people recommend everything from $100-$300. I don't like the idea of starting with more than $100 cash, but I don't want to run short, especially with smaller bills. Let me know what works for you.
Also, for those of you who have done outdoor shows, do you use anything to hold down your table cloth? I'm planning to use a fabric cover for my tables (hopefully music themed) and have been looking for something like picnic table clips without much luck. If you've found anything that works, let me know. If you don't use anything, that's helpful to know, too!

Random feature tonight. Enjoy!
Spring Jade Earrings by nemeton

Scrapbooking Armada Punch Buddy by tiram13

Mallard Drake - 8 x 12 Fine Art Photograph by PhotoGrunt

Wedding Tea Lights by CarolinaCottage

STRAWBERRY RED PENDANT....Free US Shipping by blueseraphim

Crystal Tabac Square Earrings by HidingPlaceBeadery

Spring Garden by Juliesparklybits