Calendar has to know where each event occurs in order to present time in event timezone which introduces some interesting issues like: 1) requiring location fat

Calendar has to know where each event occurs in order to present time in event timezone which introduces some interesting issues like: 1) requiring location fatigues UX, 2) inferring location is not always possible and frequently wrong, and 3) tracking location requires more data like complete travel plans. Adding to this just-another-presentation-layer problem, online event timezones are different for each participant.