I would certainly be interested providing I can actually attend my matches as I just got a new job and will have my weeknights taken, but with most tournament matches taking place on weekends it shouldn't be a big issue, if there are specific aspects of a tournament you would like help with organizing you can PM me and I can try to help you as best I can. I haven't actually hosted an osu! tournament yet but I have hosted a tournament on another rhythm game a couple years ago and that went really well