It was the "View" - Module in Event Booking that causes the 404 Error on the mainpage. With the "view" Module we showed passed events (archiv) on the bottom of the side. The error disappeared when I deactivated the module.
Re new tax rules can you clarify something for me
When you set the category, you can only select ALL or a single category from what I can see. I have set All to 20% and then set a single category, Fundraising to 0%.
See screen shot. So, will any events in my Fundraising Category take the 0% tax rate?
Is that how it works?
Yes, that's kind of legacy css which we added to the extension few years ago but don't want to remove it because I'm worry that it could change the display on existing websites
You can still override the behavior. Just go to Events Booking -> Configuration, put that css code into Custom CSS, change it to meet your own need (still need to keep !important) and it should override the original css