I dont check this board as regularly as I should and just noticed the question concerning my birrieria post from a couple months ago.
I do believe Ocotlan closes early, maybe 6 or 7 on Saturdays.
I sure thought there were some other taquerias on 26th that also serve goat but I could be mistaken. Did you try Atotonilco at 3916 W 26th? Even if they dont have goat, its still a great spot. I just posted a long piece about 26th St on chi.eats; take a look if it sounds interesting.
There are a couple other places you could try. If you look in the phone book under B youll find Birrias Huentitan (4019 W North) and Birrieria Jalisco (2462 W 47th). I havent tried either, so youre on your own.
Now that the weather is moderating, the New Maxwell Street Market is probably worth a visit. Dont know if the goat stall is back yet but the tacos and consome were good last season. It was on Canal somewhere around 14th; I dont remember if it had a name.
Let us know how the quest is going.