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Shivom Verma 34Shivom Verma 34 

The check box “Participated in Activity”(child obj field) should not be updated once the “End Date” on activity is past

SwethaSwetha (Salesforce Developers) 
HI Shivom,
You can try a validation rule on child obj .See  https://salesforceoke.blogspot.com/2019/08/salesforce-validation-rule-date.html for more details. Thanks