Yes, the release will be in November, so it seems pretty far, but perhaps we can work on some ideas from the community, instead of waiting that Marketing team proposes something. What do you think?, what you have in mind?
In my opinion having a release party alla Firefox 4 style will be a little bit odd, but can work. I don't know if that will depend on the country/culture of each community.
I was thinking more on having something like a Demo day (yeah, that's old too), showing what can be done with Firefox (privacy features, security, webextensions), and probably introducing the community, or presenting other stuff like VR.
Another thing could be what you mention above (bug triaging or mini-hackaton), but I'm seeing that more for after Nightly launch (which I think it will be late July).
It would be great if others share their opinion