Calendar

Not as far as I know. iCal used to have a setting to specify how long it kept an event (months or years). No such option is available for Calendar, as far as I can see. I need to know what the default is. I know it's more than 1 month, it appears to be more than a year, but some past events in my calendar need to be kept longer than that.

If Calendar never deletes an event, that would be great, but calendar files could become enormous.

Interesting. They used to be larger, last time I paid attention. At that size, maybe events are never deleted. That would be nice. Still, I'd like to get a definitive answer.