Ability for users to make join requests to private groups

[mikechristopher]

Self invite for group pages has been added to schedule for the next release:

Discourse Version 1.7

Focus Revamped, simpler categories page with hybrid latest panel Add group avatar logos to group settings Add passive dim red line to topic lists, indicating time of last visit Add quick search setting for large sites New site setup wizard UI experience Advanced search UI Attempt to onebox all URLs by default Support altern…