OK, formatted and shit
Small Cluster Exploration event this weekend, going around worlds, checking whatever event is active at the time and messing around with ingame world building tools. There are some cool worlds to see recently, pic related.

>What's Cluster?
Japanese social VR platform, mix of VRC, Altspace and RecRoom. Supports VRM avatars, FBT and building of simple worlds directly in game. Expect Engrish in menus.

>How to join?
Just register account at https://cluster.mu, verify your mail and upload any standard VRM avatar. You can easily convert your VRC base with UniVRM tools, instructions here https://clusterhelp.zendesk.com/hc/en-us/categories/4411636965529-Create-an-avatar and then just wait for event link to be posted.

>Will it run on my Google Cardboard with Wii Motes and 4 Kinects?
No but it runs on anything supporting SteamVR, standalone Quest, desktop and even phones but good luck joining most worlds on phone or Quest, there's no restrictions on shaders and world creators couldn't care less about phonelets (still usable for just chatting).

>When?
Preliminary date is this Saturday, time undecided but probably 7-8PM GMT.

Non-JP population is small but game itself has plenty of players and they're more than happy to show everyone around, there's persistent world chatbox so machine translation fueled discussion isn't uncommon.