404 on event pages unless permalinks are set to default

Good afternoon Tom,

Thanks so much for getting in touch!

I’m afraid that we’re not equipped to provide technical support for the Events Calendar users here in our pre-sales forum.

But, the good news is that you are still welcome to consult this forum and all our premium forums to your liking and browse it for solutions, snippets and tutorials.

We’d be more than happy to assist you at one of the following locations:

• On the WordPress.org support forum for the Events Calendar.
• If you’re a current premium license holder for one of our premium offerings (it looks like you might be based on the fact that you are using the Events Calendar Pro), please log in to your account and submit a post to the appropriate forum for the affected product.

With that in mind, normally our Calendar actually works better with pretty permalinks.
For that reason, I would recommend the following  before you reach out to us in one of the manners suggested above:

1. Try temporarily reverting back to a default WordPress theme such as twenty-sixteen to see if that helps
2. Try changing the slugs for the Calendar under Events -> Settings -> General. Make sure you use a distinct one for the calendar and the single events

Finally, I am noticing that this issue mainly impacts recurring events for some reason. I could also be related to a plugin conflict. Either way, you might want to “Update” recurring events after switching to pretty permalinks.

Best regards,

Geoff B.