Craft Show Canopies

My husband and I will be starting to attend craft shows that are being held within a 50 mile radius of home. We will be selling handcrafted beaded fashion jewelry and handcrafted beaded items, such as candle skirts, sun catchers, etc. We have purchased one of those 10'x10' canopies that are fairly easy for 2 people to set up. Question--can anyone tell me what would be the easiest way to stabilize the legs of the canopy which may have to be set up on concrete? Also, they will need to be light enough for me or my husband to lift. Those companies that specialize in tents and canopies want to add on a huge price for each IF you purchase from them. We purchased ours from Costco at a great savings, but now have a problem. Any ideas, guys?

~hotlanta