I was talking about GW2 meta-events on another forum (in response to someone saying no one does 40-man content any more) and then realised that the important difference is presumably other games actually required 40 people to complete that content while in GW2 most meta-events can be completed by less than a full squad. Which got me wondering about the minimum needed for the bigger meta-events.
I picked Dragon's Stand because it's one I know reasonably well, and because it's one meta-event where some people will still declare it impossible to complete if there aren't big groups or at least 3 commanders.
I think it would need at least 6 people - two for each lane - because during the Blighting Tree phase you need one group clearing the pods and one fighting the boss, one person couldn't do that because the boss would reset whenever they left to attack the pods. But above that it pretty much comes down to how quickly you can clear the bosses and other enemies and that I'm not sure about. I know people do raids with fewer than 10 players and I assume those bosses are at least comparable to the ones in open-world maps so I guess 10 per lane, or 30 in total, would be enough. But I'm not sure.
"You can run like a river, Till you end up in the sea,
And you run till night is black, And keep on going in your dreams,
And you know all the long while, It's the journey that you seek,
It's the miles of moving forward, With the wind beneath your wings."