Sounds like 29th would be the best. My son has a soccer game that day; also noticed a few people might be driving in, or working all night the night before, lol. So does 4p.m fit into everyone's schedule?
Also I'm going to go look at the Yukon dog park this weekend to check out the agility section. I figure we'll either meet at the Hefner Dog Park (with the doggie bakery, lol), or if the Yukon dog park is really impressive. . .