Adding a "Group Challenge" feature?

[Françisa]

Quoting anoek from a previous post where someone suggested it.

@anoek

FTR this feature has been planed since day one and all of the core stuff on the server already supports it, but we put off integrating it into the UI on the back burner until things got big enough to warrant the feature. There are a few groups that are big enough that it might actually get used now, and it’s come up a few times recently so we’ll likely get to it in the not too distant future.