It's interesting how many add-ons have been developed to manage conferences.
- https://github.com/plone/ploneconf2016.policy (used for 2016, 2017, 2018, and is the basis for work Six Feet Up is doing for a client that manages many conferences/events, and which was the basis for https://2020.pythonwebconf.com)
- https://github.com/collective/ploneconf.policy (used for 2019)
- the example running through Mastering Plone: https://training.plone.org/5/mastering-plone/case.html#background
What other ones are you aware of?