Save the items added on a calendar to a list

Hi everybody,

I was wondering if there was a way to save the items added on a calendar’s start dates to a list. For example: list = [5:30 pm, 10:15 am, 9:00 pm].By collecting the entry start dates into a list I want to make it so that multiple users cannot put an event at the same time slot. I want to allow up to only one person to be able to signup for the same time. By having a list of the StartTimes I will be able to go through the list and show a message to the user if he tries to book an already reserved time slot. For example: If someone has signed up for the time 5:30 PM till 6:30 PM another user’s time slot should not be between 5:30 - 6:30 PM.

Thank You!