#####User stories:
As an organizer, I want to be able to set group goals for my events, so that I can motivate participants to actively participate in the event as editors and so that I can have a sense of when my event is "done" and how can I report on the impact of my event.
#####Acceptance Criteria:
* Investigate how we can allow organizers to set goals for an event, which means:
** Organizers can set goals in the following format: [number] of [data point that we already collect in the Contributions tab, like new articles created]
** One goal at first, but maybe later multiple: At first, we will probably only allow them to set 1 goal per event, for the sake of releasing a simplified first version. However, over time, I can imagine us allowing organizers to set a few goals (for example, a maximum of 3 goals), which can be tracked. For example, they could have a goal of creating 10 articles with at least 30 references added (if we later collect data on references).
** Goals will be collectively shared by the whole group. So, any edits made for the event count toward the goal.
* Investigate how we can track the goals set for an event, which means:
** There should be a progress bar for quantifying progress toward goal.
** If a group exceeds the goal, we should still track how much they exceeded the goal (i.e., we shouldn't stop tracking when the goal is reached).