I don't want to change core code files

ERPNext
3

Hy @Rajat96318

Please You can see the override method in the hooks.

Override JS File

doctype_js = {"doctype" : "public/js/doctype.js"}

Override Whitelist Methods

override_whitelisted_methods = {
	"frappe.desk.doctype.event.event.get_events": "custom_module.event.get_events"
}

Thank You!