i want to create an event bot reminder with google calender via discord

I want to create an event bot reminder with Google calendar via Discord
I want the bot will start sending reminders for example: at 2 pm I want the bot will start sending a notification an hour before 3 times every 20 minutes. Which tool should I use for that I tried using delay but I need to set it as the start point at 1 pm not the capture event for, the calendar.
I have tried different variations to come-plish that with an error message when I tried to type -45 minutes in the delay step

summary for my use case: I want to extract time from the time the event starts from the calendar so I can set an automation that sends reminders
@Supreme @ArshilAhmad need your guidance here.

I managed to do this thanks guys