Subevents and possible migration from array to own registrant collection ?

[Bobby2500]

{
name: "string",
description: "string",
location: "string",
startTime: DateTime,
endTime: DateTime,
BufferedStartTime: DateTime,
BufferedEndTime: DateTime,
checkedIn: [user_id], (If user id exists, user is checked in, otherwise, user has not checked in)
}