Springtime would be a major contention with the majority of those attending both events. Whatever works out for the track around Labor Day weekend, before or after, would be best. Branson Z Fest is scheduled for the weekend after Mother's Day this year. If Denver decides to do it in 2009, I know I'll be there. I missed last year and don't want to miss the MidWest Z Fest again. I've really enjoyed every MZF that I've attended. Good Info LJZTT.