A visitor sees actions which are associated with a campaign on the campaign page

Problem/Motivation

Campaigns and Actions → on Drutopia sites currently have no connection, and people naturally expect them to have a connection.

The workaround right now is to have both campaign and action have the same Topic, and maybe we could do more to surface campaigns

Proposed resolution

Allow Actions to reference Campaigns and show these Actions on the referenced Campaign page.

Remaining tasks

User interface changes

API changes

Data model changes