Hi Grant,
Making recommendations like that is always especially difficult because it's more about the workflow that will work for you. What works for one team might not make sense for you, and Trello is designed to be flexible enough to work with all of those types of workflows.
That said, different boards for each event sounds like a good place to start, but that depends on how much there is to coordinate and how much content is associated with each event. Similarly, I'm not sure I can tell you what's best when it comes to if you should have one board for admin and communication—that depends entirely on what your needs are and what sort of communications are necessary. Some teams, for example, might find that this is more easily handled via chat and calendars, with additional boards set up by sub team.
I think you have a good starting point, but importantly, there's no best way to use Trello, so I would encourage you to give it a try. The best way to use Trello is the one that works for your team, so if you try this and it has some problems, you can change it!
We do have a couple of example resources that you may find useful:
One is our Inspiration Boards which can serve as real-world templates: https://trello.com/inspiration
And we also have a series of Team Playbooks to show how real teams can set up and use Trello: https://trello.com/teams
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