Hi Dirk,
Thanks for getting in touch. Sounds like a cool idea! Your idea of having runners register with free tickets is a good one. Many folks use our ticketing plugins for something like that.
There is not currently any built in way to show users what events they are registered for or have attended. It could certainly be possible with some customization and/or third party plugins, but that’s not something we’d be able to assist you with. Does that answer your question?
Best,
Leah