i post events to my facebook page automatically, a few times a day, with an RSS feed. that takes most of the work out of it. i just check in every now and then just to see what's happening and read the comments. i do the same with twitter.
the only traffic i want from facebook is the kind that comes straight back to my website, after clicking a link on one of the events. i dont want the ones that just read it and stay on facebook. although i suppose its useful if they share the links with their friends and help to spread the word.
any traffic is good though. even if you have to put a little work into it