Cathe's gym offers day passes for visitors (they used to be about $10/person, but the cost might be different now). Cathe typically teaches a few times each week and the gym's schedule is online (google Four Seasons gym in Glassboro, NJ). But Cathe advises that you call the day you are planning to visit to ask the front desk if she will be teaching that day because even if she is listed as the instructor on the class schedule, she is so busy that sometimes she needs to get a sub to teach in her place.
I hope you get to go! Working out with Cathe -- in person -- is a BLAST!!!