Hmm. Even closer. I’ve modified the action so it includes a field for onclick, and it adds this with the field contents… as long as there’s no quotes in what I type. But I do need to single-quote the function:
toggle_visibility('event-preview');
(Or at least I don’t know how to make this work without quotes, or how to prevent the action from stripping those out.)
Maybe it’s time to take this to the ActionsDev section of Freewaytalk… 
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