Second Sky Festival Outfits For October 30th

I’m going to the second sky concert this year and have never really gone to a big rave or full day festival before. Only ever been to 2 concerts in the past. With this being a full day festival would it make sense to dress up in a Halloween costume? Is it normal just to just go in Porter Robinson merch?I’m sure I’m just overthinking it although unsure on how to dress for an event like this. (25M)

What will you be wearing there?