How often is Double XP Weekend in Halo 3?

[dprechtl135]

How often is it and can you give me a link to prove it if you can?k

 

[Happy Video Game Nerd]

its only happened a few times, last time was on bungie day. Not sure when the next time will be (if there will be one)

EDIT* wow turns out i was wrong, i had no idea its double xp every weekend. and i play halo 3 all the time lol