Got a bad sunburn help me please!?

I got a sunburn today on my shoulders chest and upper back and a little on my face, its saturday and the fourth of july is monday. Im going to a cook out at our neighbors that we are really good friends with they have a son thats 4 and he loves for me to play with him and shoot off fireworks with him and i dont want to be in pain, what can i do to get rid of it or atleast make it a ton better. I dont want to peel.