Hi again, Lindsay!
So sorry for the trouble here — that error is super strange.
I see you tried the following:
- Deactivated all other plugins? Yes
- Switched to a default theme? Yes
Did you happen to notice any difference when you switched to a default WordPress theme (like Twenty Sixteen)? How about when you deactivated all other plugins (except for WooCommerce, of course)? Does the error continue to pop up in those default conditions?
If so, it would be awesome if you could head to Events > Settings > Help, copy the System Information at the bottom of the screen and paste it here for me as a private reply so I can check some additional settings.
Thanks!
Geoff