As it currently stands, GW2 offers several holidays and events – this is no news to anyone who has ever subscribed to GW2’s emails. I get two or three of them every time they update the game. But they’re all universal holidays. Somehow all of the races of GW2, with all of their differing values and background, magnanimously came together to celebrate everything together in big cozy Lion’s Arch. I feel that a little unrealistic.
Why not a Sylvari “Festival of Ventari,” or Asura “Invention Expo,” “Call to the Six” for the Humans, “Celebration of the Khan-Urs” for the Charr. The lore of the game simply does not exist in this game except for the occasional Old Lion’s Arch ruins at the bottom of the ocean, Granite Citadel historic site, Gwen’s grave, statue of Jora and Pyre Fierceshot, etc. I mean, it’s all fine and dandy that Queen Jennah is the queen, Snaff died, and Thaumanova exploded (and kitten , a nuclear reaction explosion in a fantasy game, what the hell). That’s all we know about recent history.
in short, (TL;DR) – Make cultural events, not just Tyria-wide.