I closed the bug because I wrote a fix that hides the link to the tag creation page if the user does not have access rights, so nobody will come across the useless page you showed above. As this fixes the immediate problem, I consider the issue closed.
Can you confirm that in your event's review settings (pictured below) the permission is "add, remove and create" tags? In that case, I will re-open the issue, but otherwise, pretalx works as intended.
Unable to set up tags in the following screen:
I can't type anything in the text boxes, or in the "Show tag publicly" checkbox. When I select "Save", I get an error message: "You are trying to change read-only data"
Successfully create a tag to link to various proposals
Steps to Reproduce
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