Held at Casa Grande, AZ. Cactus fly-in is centered around antique aircraft, but quite a few homebuilts and later model airplanes show up. They do set aside a separate area for homebuilts at the Cactus. For 2010, I was there on March 5. It usually runs two days, and as of 2010, they had settled on Friday and Saturday, with Sunday being a non-public day for people to travel home, if they stayed through Saturday.