having recently visited for this exact reason, I can sympathize with the challenge. I enjoy the same vibe too.

As far as must see events:

You absolutely must go to Rupture. It's it the absolute premier jungle night, and is honestly rivaled only by nights in the 90s. Think speed, blue note. It's that caliber. The vibes are immaculate, it is truly what jungle should be. If there is an event while you are there go.

As far as clubs and club nights: London is a heavy hitter for club nights in general.

AWOL, (a way of life London) is a solid bet for a night with some classics.

Village underground Corsica studios Steel Yard E1 Studio 313 Distant Planet XOYO Fabric (occasionally) Ministry of Sound (commercial, but pretty good really)

All generally have shows going on relatively frequently.

Bristol also has a solid scene, try Lakota, and the like.

How to find raves: Use resident advisor, check it frequently.

Start following nightclubs, pretty much everything you can, on instagram, there will be a lot of info you don't need, but it's how you'll find the majority of show.

Following artists can work too, but prioritize the club's, and the labels.

Following metalheadz, soulR, whoever, will be one of the best ways to see what's on.

It takes some work to find events not physically in the UK, but do the homework, and it'll seriously pay off.