No, it would be an admin of which there are three. Most of the time, I am the one who removes messages from the site - mostly stuff like questions which were never answered and are so old that no one is likely to ever answer them. It's certainly possible that I deleted the event posting - though I cannot guess why I would have done that, it could have been accidental in the course of cleaning up posts.
Re-post it if you can; it would be good to have it back on the site.
--Glenn