I've looked around for a solid event calendar for WordPress because my client does a lot of traveling for workshops. There are few options available that do a good job.
Although I found the documentation lacking and the set up clumsy, I got it working things were seemingly fine. I do not care for how the categories work, or for how the information is stored within the database. But, I could live with all of that.
Unfortunately, at some point in recent history, the events disappeared. I didn't realize this happened until my client contacted me; which is professionally embarrassing.
I put my reputation behind this plugin and I can no longer count on it to work correctly.