I had the same problem.  I'm logged in to Hipchat through another project and I just get redirected to it.

- Steve

On Thursday, December 4, 2014 5:06:16 AM UTC-6, Stefan van der Walt wrote:
Hi everyone

On the weekend of 12 to 14 December, we'll be sprinting to release the
next version of scikit-image.  Since we're spread out all over the
world, from Australia to the US, we'll do tag teams as necessary.

No matter your level of expertise, we can use your help!

In preparation, I'll be triaging tickets for the 0.11 milestone, which
you can find here:

https://github.com/scikit-image/scikit-image/milestones/0.11

The event will be coordinated via HipChat:

https://skimage.hipchat.com (sign-in required, full history)
http://www.hipchat.com/gVXougY5x (no sign-in required, no history)

I look forward to seeing you there!

Regards
Stéfan