As an event organizer, I want to be able to add the topic of my event, so that people can find out about my event due to their interest in a certain topical area.

Documentation:

• https://www.mediawiki.org/wiki/ORES
• https://github.com/wikimedia/wikitax/blob/master/datasets/wikiproject_taxonomy.halfak_20191202.yaml
• https://wikitech.wikimedia.org/wiki/Machine_Learning/LiftWing#Article_topic

Acceptance Criteria:

• Investigate if we can use the ORES topic models (or LiftWing, since ORES is being deprecated) for events
• Note that not all events will fit the ORES topic model, since not all events focus on creating content for Wikipedia, but it could apply to many events