via press release:

September 2014 Programming Highlights for Girl Meets World
*All programming subject to change*

Friday, September 12
Original Series – Episode Premiere
Girl Meets World “Girl Meets Smackle”
(8:30 PM – 9:00 PM ET/PT)
When Smackle, a debate champion from another school who happens to have a crush on Farkle, realizes that he only sees her as an academic rival, she enlists Maya and Riley to give her a makeover.
Guest starring Cecilia Balagot as Smackle
TV-G

Friday, September 19
Original Series – Episode Premiere
Girl Meets World “Girl Meets 1961″
(8:30 PM – 9:00 PM ET/PT)
Cory gives the class a living-history assignment that takes the four friends back to New York City in 1961.
TV-G

Friday, September 26
Original Series – Episode Premiere
Girl Meets World “Girl Meets Crazy Hat”
(8:30 PM – 9:00 PM ET/PT)
Cory divides his class into two fake companies for a lesson, one driven by profits and the other by making people happy. Meanwhile, Riley and Maya encounter a lady in the subway who is quite different than they first perceive her to be.
Guest Starring Jackée Harry as Evelyn Rand
TV-G

Source: NickAndMore.com