I've seen similar question here. But it doesn't work for me. I've added my url scheme with calendar event's url property. It's pretty cool to see scheme url appeared in event's url row. But I couldn't tap on url(url scheme) as like normal url like www.google.com
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code for adding url to EKEvent
EKEvent *event = [EKEvent eventWithEventStore:eventStore];
event.title = @"Event Test For adding url";
NSString *customURL = @"sampleEventappScheme://";
event.URL = [NSURL URLWithString:customURL];
After event added to calendar event, see screenshot for better understanding.
Note: If I try to launch app with safari using this scheme, It's perfectly worked. So there's no issue with scheme configuration.