To help agents fill in event details and request dates for open house events without double-booking them, the administrator should create an approval process on the Campaign object, which is used to manage marketing events in Salesforce. The approval process can define entry criteria based on campaign fields such as type or status, specify initial submission actions such as sending email alerts or updating fields, assign approvers who can review and approve event requests, and specify final approval actions such as creating tasks or updating fields. Creating a workflow rule, a sharing rule, or a campaign will not help agents request event dates or prevent double-booking. References: https://help.salesforce.com/s/articleView?id=sf.campaigns_overview.
htm&type=5 https://help.salesforce.com/s/articleView?id=sf.approvals_considerations.htm&type=5