Here are the dates and times for the 2017 Sprints:
|50MHz:||Sat-Sun, August 26-27, 2017||2300Z Sat Aug 26 to 0300Z Sun Aug 27|
|144MHz:||Mon, September 18, 2017||7PM to 11PM local time|
|220MHz:||Tue, September 26, 2017||7PM to 11PM local time|
|432MHz:||Wed, October 4, 2017||7PM to 11PM local time|
|Microwave 902MHz and up:||Sat, October 7, 2017||8AM to 2PM local time|
The rules are posted here.