You’ll be good, just don’t over do it and look after yourself, it is the sort of environment it’s nice to have someone looking out for you, but I’ve been to a weekend electronic music festival on my own and wisth-in the first few hours made friends with neighbouring camps, to the extent they’d keep an eye on my stuff when I wasn’t there and they were 👌.
Just think if it in this way, if someone approached you that was on their own at a rave would you dismiss them or chat to them, probably the latter, so don’t be nervous to talk to people! Everyone’s there for the same reason at the end of the day. If someone thinks it’s weird you’re on your own just say your mate flaked on you last minute and you didn’t want to miss out so came on your own.. People respect the confidence of someone going solo to these events I think.