Open Sessions activity list

Hey gang,

This is the activity list from Open Sessions. Note this includes
unsanitized user generated content, where some activities were added for
draft sessions and not published.

Source: https://app.opensessions.io/activities

We're really looking forward to having a standardized list as this is
currently non-hierarchical, unverified and incomplete, so do let us know
when there's something available!

Regards
Oli
(*Open Sessions* developer)