Update below (2017-05-05): Stays that crossed the April 1 boundary count!
Hyatt Gold Passport turned into World of Hyatt in March 2017. The first big promo for World of Hyatt launched recently, offering double base points for your *second* stay and beyond, through June 30, 2017.
Sign up for the “Double Points For Being You” promo here at hyatt.com. You need to be a World of Hyatt member of course (Hyatt Gold Passport members were cut over March 1st).