Is it best to avoid all interactions with disreputable or predatory conferences? Potentially predatory publishers and journals (as listed on Beall’s list here) are springing up more and more often, but they do not always stick to journals and publishing articles. Some host conferences, workshops, or other events with reputable chairs and directors. 

If the publishing agency behind a conference is fishy or believed to be predatory, but the conference it hosts is chaired by reputable names, is it still best to avoid the conference?

Has anyone had experience going to a conference or workshop like this?
Publishing in predatory journals looks bad on your resume.  It suggests that your work was not good enough to publish in a respected journal/conference, and, frankly, you're better off not publishing the work.