These tents have popped up in most grocery store parking lots and many empty lots around town as well. They are all selling fireworks - a huge variety of noisemakers are available. The weird thing in Tucson is that fireworks are illegal within the City limits! So even though you can buy them within the City limits, you can't light them!
I'm a transplanted New Yorker who loves the Tucson climate. On New Year's Day I have a bit of fun calling my (snowbound) east coast friends to announce that I'm drinking coffee while sitting on my patio. (: