I remember that I used to watch a Minecraft Let's Play series, but I have no idea which Youtuber was. All I know is that it was a group of people who have built a pretty big base in this Let's Play. Somehow there was sometimes an event in which for a series other Youtuber were there. Does anyone know who that might have been?
Do you mean the mega-project? (This is not a Vanilla Minecraft but a modpack)
Maybe freedom from palutes and GLP or craft attack from up to 30 people
PietSmiet often had guests in the Minecraft Seasons.