Most in-game weddings in 24 hours
Who
Rift Online (Trion Worlds, 2011)
Where
United States (Redwood City, CA)
When

The largest wedding event in a MMORPG featured 21,879 in-game marriages between players and was carried out in Rift (Trion Worlds, 2011) for Valentine's Day on 14 February 2012.