>>343320242
>>343332019
I've thought about how to do this, I think I posted about it a couple years ago. Any friend can get a world link to your current (public/friends+/friends) location, even if they're not online and in the world themselves, through the vrchat website/API. Thus, you can make a vrchat bot account and have people send it friend requests, and you don't actually have to log the bot in-game or have it join instances. It's just a queryable friends list. 

With that bot account, you can make a web page that's essentially the same as the vrchat "location" page as viewed from the bot, but with the names filtered out, and only friends+ instances. You could then choose the an instance from those (highest population, or lowest, or newest, etc) and have a link that redirects to that instance. Or you could just display them all and let people pick.

Sounds like their discord bot does the same thing, except they also filter to instances with "at least 1 event admin present" and have some arbitrary tiebreaker. You could do it purely leaderless too though, as long as enough people have the bot friended (and are on green/blue status).

Even without a separate bot account, you could do a similar thing with your own account, where you make a webpage that redirects to your own current location for a short time. I've thought about doing that for high map turnover times like vket exploration; it'd be like a temporary friend request I suppose.