Customizing the Event Responsibility picklist

To edit the Responsibilities picklist follow these steps:

1. Navigate to the Contact Schedule Item object Setup and select Object Manager.

Note:  If you are using Salesforce Lightning, go to Setup and, search for Object Manager, click label for the Contact Schedule Item object.

2. Scroll down to Fields & Relationships and click the Primary Event Responsibility Field Label
3. Scroll down to the Picklist Value Set and add/edit the picklist values as needed.

Note: Be aware that the Responsibility picklist is used across all events.  Deleting or editing an existing Responsibility will impact all events.