In the greastest Star Wars MMO of all: Star Wars Galaxies ( pre cu ), players constantly made events like weddings, parties etc.
Players could get married in game and weddingparties were thrown all the time. Opening a new mall? Let's invite everyone to an opening party.
Because the game was a sandbox, we had to make our own content and it was brilliant. It forged a community that was unique.
Players bonded together regardless of being rebs, imps or neutrals and even guild rivalry was put aside when attending event like the Christmas party held in the Krayt dragon graveyard - the Kraytmas party. Because the game had an entertainer class, there were bands litterally playing music at the event accompanied by dancers.
It was a wonderful gaming experience and I hope some of you were as lucky as me to have experienced it. My fondest gaming memories are from that game and the community it made.