We've been to Space 220 once and have no plans to go again. (It was OK, something every Disney fan should experience, but not something worth doing again.)
Still, for our upcoming 5-night onsite trip, I checked at about 6:30 AM on the first day and could not find Space 220 at 60+5.
SciFi Dine-in was the other tough one. That was available only at 60+4.