It's up to the TD/LD to submit events via the forms on the main page under the calendar.
I've been telling people to just show up at the Valley on April 3rd. If there isn't a Sundog there will at least be 100-200 people thinking there is.
I saw on Par72 site that it said 2011 April 3rd 1-3 flex and 5pm shotgun (so I think the 2011 might be a typo, as we started April 5th last year)
On the sundog website under schedule it just has chili dog listed, so that is why I tried here to see for sure.