Where and when are pretty much the same thing, in the physical sciences sense at least.

DC to Chicago 9/1 to South Dakota 9/4 to Seattle 9/6 to Olympia 9/8 to Portland 9/9 to Eugene 9/13 to San Fran Berkley and Oakland 9/14 to Santa Cruz 9/22 to Los Angeles 9/23 to Vegas 9/28 to Austin 9/29 to DC 10/1 to Philly 10/5 back to DC to Boston, Amherst etc. 10/11 back to DC to New York 10/17 to wherever whenever.