Skip the ‘open series/open occurrence’ step
When a user clicks to open an ongoing calendar entry, it always prompts to open the single occurrence of that day, or to open the series. I find it clunky and redundant to ask every single time, especially for users who don’t have permissions to edit entries (like my employees).
A more elegant solution would be to have a button somewhere within the single-occurrence entry that takes you to the series. This way, the series/occurrence system is not disturbed, but the user doesn’t have to click twice every time they want to view an entry. It’s essentially a UI change.