The two men put on a show at the 2013 Millrose Games, with Sowinski breaking the American record.
The junior from New York took 6 seconds off the old mark.
Two meets will be broadcast live to subscribers.
Brit leads five men under the 4:00 mark.
According to the Armory Foundation president, 105 dates are filled in the schedule.
She had been sidelined for seven months.
Written By: Peter Gambaccini (c) 2010 Race Results Weekly, all rights reserved With the challenge of the Wanamaker Mile at the Millrose