Asking for a friend. Events in a small area like a small cave would be especially grand. E.g. destroying some skull in a cave spawns (event 1) a few waves of enemies (event 2) followed by a boss (event 3), something like that.
Edit: maybe I should’ve specified that I’m strictly looking within core content. No DLCs or expansions…
If its for the “do X events” weekly: the EoD map Dragons End, has a minidungeon called “Trial of the Elders”. You need a Jade Bot Mastery to enter and it containes a total of 8 very fast events (they count as events but give no loot/xp), they can be done in a group or solo (recommend power reaper for solo play).
Core content. But good to know for others. :D