There is a coupon book that is sometimes available that includes 2 for 1 at some of the CW locations. If there is a general happy hour that has 2 for 1 then I made a huge mistake in missing out on it during my last stay.
I don't think there are any Happy hours at the hotels. In city walk, there was a couple of restaurants that had Happy hour from 3-5, I think Nascar was one. Go to Mousesavers. com. Under Universal there are some coupons you can print.