Edit the text to whatever you'd like this reminder to be. e.g. "Meeting"

Edit the priority and status properties as you like. 
Click "High Priority"

Edit the priority and status properties as you like. 

Click this checkbox to include a time for your event or task due date.

Click this text field to edit the due time.

You'll now receive a reminder for this Meeting at the time of the event (5 mins before).

If you'd like to make another copy of the 'Remind at time of event' item, click here.

You can also quickly generate a new task that will have an 'On the day' reminder by pressing this pre-configured button automation.

How to Create a Meeting Reminder in Notion