Two nights at the track didn't hurt it. My sons race every weekend (sometimes twice a week). When they had their CBR 600 F4i's they would leave the line with the throttle on the stop (sometimes hitting the rpm limiter) while sliding the clutch out of the hole. They went two years before putting a clutch in. And oh, the one had NOS on it.
Like said, the first thing that I would do is change the fluid.