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Jeffrey Suarez Events - Object Manager - Ability to select 'New' under Fields & Relationships
I am not presented with the option to add a 'New' Fields & Relationship on the Event - object manager. Can someone explain to me why this Object is not showing this option whilst the other objects are? Greatly appreciated.
Events and tasks are both listed as part of the activities object you will need to create your custom fields for task and events by navigating to Setup, Customize | Activities | Activity Custom Fields.then add this field to Events page layout.
for more details follow this link
https://help.salesforce.com/articleView?id=000205377&type=1
Hope this helps you.