How to keep makeup from melting?😭

So im doing a shigaraki cosplay at fan expo soon and if you know who that is then you know he has some pretty significant scaring and stuff so I was planning on using makeup.

Ive practiced and I like how it looks but the problem is that I sweat a lot and it makes the makeup fade really fast, and I dont wanna have to keep reapplying it at the con.

Also I never do makeup irl so im not good with it, how do I keep it from fading and like, melting??