Add the 2019-20 and 2020-21 events to the Repo

Since the event repo was not updated for 2019-20, the events will have to be compiled and then added to the repo now.

Please comment with the details of the events that were organized during the time so that the event list can be compiled

Start by reviewing the talks repository and gathering the event details requested in the issue for the 2019-20 and 2020-21 periods. Done means the missing events have been compiled and added to the repository.

Written by the indexing model from the issue text.