Party planning tips pls

I've been planning this end of the schoolyear/summer solstice party for about 3 days now, set to be on the 23rd, and I already have about 20 people confirmed to be coming. Which is a bit overwhelming but nice at the same time, I wasn't expecting it to move so fast since I haven't even posted about it. And this is the first party I've ever thrown.

It's going to be in my teepee at my house, I'm going to deck it out and have food for people to roast, bathroom access, etc. (I was going to make food for them but they're grown and if you cant roast hotdogs you shouldn't be going out lmao.) It'll have alcohol and music and the whole shebang but its 100% due to the helpful people who are already coming. Even if there's more then I excepted coming already I want it to be safe and fun for all the people coming so even if its overwhelming its kind of pushing me to fix little problems in my plan. 

I feel like it will turn out pretty manageable but I need some tips to make sure its good so if anyone has ideas please shoot me with them it would be very helpful. <3