I find it bizarre someone would pay good money to listen to what they know will be excessively loud music and yet be asking what devices to purchase to blank it out...
It doesn't blank it out at all, a good set of plugs just reduce the volume to prevent hearing damage. Something that people don't understand until it's too late. I used to walk around clubs wonder why the hell people were wearing ear plugs, then I woke up deaf in my left ear after a night out. It came back a week later but with a permanent ringing (think COD flashbang after-effect). It's also a very UK thing to not wear earplugs. Go to any European mainland event and you'll see that there are far more people wearing them.
I've tried a few different ones over the years:
Standard foam plugs - Muffle everything too much
Earpeace HD - Distort bass
Alpine PartyPlug - Distort bass
Alpine PartyPlug Pro - My go-to plug now when I'm at events.
Next, I'll be going for a set of ACS Pro 17's, they're custom made taking a template of your ear. Not cheap at £140 but I definitely think they're worth the money if you want to protect your hearing. There's no going back!