Maybe reach out to other muscisians who have played there and see if there are any bad experiences as well? Or even customer experiences? I think it would be good to collect info and then release it over time on social media to maximize negative publicity (like once something dies down release a new thing to get interest up again instead of coming out with all of it at once). If you are or know someone who is good with SEO you could even try to make it so that your things show up first

I'm not super sure about rhe fliers stuff unless it is reallllllly well made and the argument is super solid with a lot of evidence because it could backfire if it's just rude but has little evidence