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That is not likely. Just promoting an event doesn't mean it is your event or that you owe the readers a duty of care.
You should not make promises or guarantees though as you would not want someone to say they relied on your expertise. Do you see what I mean?You could retain a lawyer to draft a short and clear statement that you don't own the event or run it etc.
It is a good idea in my view but I am not an expert in that area of course.