Rescheduling an event is easy if you are the event admin.
Start by clicking on the Event itself then you will be able to Edit the event

Then suggest new dates and times if needed.
Then, you can confirm the event for the new time. 

Pro tip: If the other invitee(s) already know(s) about the modifications of the event you can confirm it without needing their vote. The event always lands in their calendar after confirmation except if they already declined the event 👌

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