I'm planning to fly up from Houston on Friday (as long as the cold front doesn't get ugly). Heading for RBD and Ambassador. But a buddy of mine is picking me up at the field, so I don't have to worry about ground transport. If I did, Love + DART is a good way to get *to* the fair, but depending on when you leave you might have a long wait for a return train. (BTDT in previous years.)
Be wary of Uber-ing; not sure if the fair qualifies, but Uber's app has an algorithm that starts jacking up prices when it senses big demand at a specific location. I think it typically kicks in when big events like sporting events, concerts, city festivals, etc. let out and all of a sudden several hundred or thousand folks are trying to call a ride.
You might make it to the fair for a reasonable price, but then you might get hosed when you try to leave.
http://www.theverge.com/2016/6/23/12017002/uber-surge-pricing-upfront-fare-app-update-announcement