function readOnly(count){ }
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You cannot edit this component but you can add or remove or rearrange the different actions. Please find the similar answer answered on Salesforce Stack exchange.
https://salesforce.stackexchange.com/questions/245006/how-to-add-fields-to-new-event-under-activity-tab-in-lightning
Let me know if you need any further details.
If this solution helps, Please mark it as best answer.
Thanks,