I know you can download an ics file once an event has been approved but it takes time and a lot of clicks to get that done. Additionally if someone is not an authorized user they cannot do this anyway.

A great solution would be to simple attach an ics file to the email that a requestor receives when the event is approved. That way when you get the email you can open the event, invite participants and add to your calendar immediately.

Good for outlook or other calendar apps