I think you probably know that Halloween is coming soon, it might be too late to do anything (unless you've started it already) but holiday themed events always attract a lot of attention. In other games I've played that have them, they've always been really fun. So as a suggestion to you Bungie ^_^ it's something that myself and a lot of others would enjoy, complete with new Halloween themed armour, weapons, shaders and emblems? Haha, I know it seems a lot to ask but just a suggestion. :)
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It doesn't really fit in with the theme. Then again, if they can pull of one as good as TF2's, no one will give a -blam!-. Agree.