This brings up an important point:
Because of alarm fatigue, I avoid adding TODOs to the calendar that are not real TODOs. Something like "write report" I don't really need on my calendar. I know I need to do it. I'm talking with the client. Etc.
Something like "[Friend name] should be back from [place name] by now. Call him!" matches it better. The type of things that would otherwise slip by.