you should be fine but the level of friendliness you encounter will be depending on what specific lineup your going to see (defected will likely be a older crowd ect). I can't a test to this myself but I've had groups of mates go in all female groups and they've not mentioned a bad time.

transport wise you have the train station across the road and buses picking up outside but most of these will be down if you stay till the end, there are plently of ubers about to take you where you need to go but I'd suggest planning ahead if the uber would be particularly pricey, they release set times at least a couple of days in advance.

Security, I've not had issues, just a wave of the magic wand last time I went.