lenolan

I also ran into this problem being on GoDaddy Managed WordPress. I ended up switching to a Google calendar and using the ICS Calendar plugin to feed all the calendar views I needed.

If you are managing the calendar for a not-for profit this is a nice free alternative. In some ways, I prefer the default presentation over the All-in-One event calendar. If you need more customization, there is a reasonable lifetime license for the Pro version.

Moving the calendar entries over was fairly straightforward. I subscribed to the time.ly calendar I had set up on my website. I created a separate google calendar for each of my categories. I then copied each event from the feed into the corresponding Google calendar. Using shortcodes, you can combine any number of Google calendars into a single view so this simulates the category filter.

This method is a better fit for the skating club I support. The google account belongs to the club and can easily be updated by a volunteer.

In fact, when I first installed the All-in-One event calendar plugin we used to use a Google ics feed. Then they made it a paid feature so I had to move all the events into WordPress!