I’ve had this tent for a few years and it’s perfect! You can fit three queen/full size air mattresses in it and it’s great at keeping the rain out. And at an awesome price!
Coleman 8-Person Tent for Camping | Elite Montana Tent with Easy Setup https://www.amazon.com/dp/B001TSCF96/ref=cm_sw_r_cp_api_glt_fabc_TN8T5TVTZ86HX9RMXS38?_encoding=UTF8&psc=1
I bought this tent for last year. Personally I was not a fan and bought another for other festivals. We fit 2 people in this tent and it was tight. I also did not like that I always had to bend down in it (it is not tall enough if standing). For the price, this is the most economical... But if you want space and the ability to stand I would not suggest it. I ended up buying the following and love it... we sleep many ppl in it: http://www.amazon.com/gp/product/B001TSCF96/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
The Montana is 96 bucks if you have Amazon Prime (the link is different now)