Add custom fields to my google calendar

I want to have the ability to create a new invoice triggered by google calendar new event. the problem is that i need mor data filed on google calender new event: -Name (drop list update by google sheet contact list) -Phone (Auto fill by name) -email (Auto fill by name) -job title (text) -add Item (drop list update by google sheet item list) + (Option to add more items) The new event with the new data should automatically create a new row in google sheet