The best pop up canopies are, unfortunately, around double what you would like to pay. Sure, you can find lots of canopies for around $40 to $80 but chances are they won't make it through more one or two storms or windy days. If you only plan to use it for one or two festivals then ignore the rest of this comment.

If you want one of the best canopies money can buy I recommend either the Caddis rapid shelters. https://smile.amazon.com/dp/B0151OZVDK/ref=cm_sw_r_cp_apa_i_bI.dCbG4GV8R6

Or something like the Eurmax https://smile.amazon.com/dp/B00FF34B0W/ref=cm_sw_r_cp_apa_i_zJ.dCb8ADR57G

Both of these canopies have heavy gauged steel and aluminum that can withstand abuse and thick, waterproof covers. I own the Caddis one and it's been through 40+ mph winds, a tropical storm, torrential downpour and about 10 festivals/camping trips now over the past few years. It still doesn't leak and the legs are only slightly bowed from the strong winds it encountered 2017 Okeechobee.

I'd actually recommend the eurmax one through since the bag it comes with seems nicer (wheels on the bag are great when the canopy is as heavy as these guys) plus it's slightly cheaper and it has the metal rings on the corner which is perfect for putting up tarps or tapestries for shade and privacy. Also looks like it comes with sturdy stakes too.

Yes, this is double the price you'd like to pay, but I promise you it will last you many more festivals than a $80 one. And is very unlikely to fail on you like I see so many peoples canopies fail on them at festivals.

My experience is, you can buy cheap canopies every couple of festivals or you can buy 1 for the next 20 festivals.