Yes that's the one, Franklin Park.
I actually entered the Arlington Park (Chicago Pet Expo) show with my cats the last two years. Not the purebred show, the household pet show which was separate from the CFA purebred show there (held in a separate part of the building, totally not connected). You're right, that one is definitely not "low key" as far as the atmosphere around because it is such a huge all-pet show and so many people. I had Harlequin at that show and she was competely at ease and not at all phased by the crowds, dogs, or other critters. The people at the HHP show there were really nice and good about explaining things though, and the HHP show was pretty low-key itself (as much as it could be in that environment anyway.) Actually my kitties won "best in show" for the Arlington HHP show the last two years! Roxy won it last year, and Harlequin won it this year.
The only TICA show I've been to was from the Prairie State Cat Club, the same one doing the Franklin Park show but it was in the spring in Wheaton. However I didn't really get a feel for how the HHP stuff worked or the scoring at all in that show because the HHP I entered (Church) was misbehaving, did not get any finals and I ended up only showing him for half the rings. I also took my Maine Coon to that show but since she was in New Traits and the only one entered in her group all we did was go up to the ring, get a quick going over by the judge, get a 1st place ribbon and go back.
I posted on a Yahoo cat show group asking if anyone was going to the upcoming show and could help me to figure out the scoring stuff and I got a few replies. One of them was actually one of the judges at the Arlington show and is a TICA HHP judge (but not at this show), so she said she would help me out.