I have set up Shared Calendars where Admins are able to CRED new events and Users are able to Read/Register to these events and Add their own events (not visible to other Users). I need to find a solution to support these permissions and I've been pointed to Validation rules but I need help on where to start please as I'm not good at formulas. The SF Help resources aren't helping with this issue.
Many thanks in advance :)
You can go to Object Manager, search for Event and under validation, create your validation rule. You can reference fields from the current user's profile or any other information.
Please let me know if that helps!
You can reference this link to understand how we can create validation rule on any object
https://trailhead.salesforce.com/content/learn/modules/point_click_business_logic/validation_rules