Design a system for an event planner where a user can create an event and add other google users to it, the users can then vote for a venue to host the event at. All users should be notified once the event is decided.

I struggled a lot to define data models and requirements for the system, interviewer mostly said to focus on event creation/assignement and voting and ignore notificaions until the end.

It was also said that we can assume all users have google accounts and all venus are on google maps.

It was like google caldendar event system.