Did I make a mistake - Received an offer for S&T

So I received an offer for JPM SA S&T about a week ago and accepted it yesterday. I don't know what desk I will be placed on and won't know until April (I think). However, BAML S&T also invited me to their superday in February, but I didn't think I could go because JPM only gave me 2 weeks to decide. When I emailed alumni from my school at baml letting them know I took JPM they told me they could've sped up the process for me.

I'm wondering if I made a mistake by just blindly accepting JPM without trying to do BAML's superday. I feel like JPM is the better shop, especially for S&T, but it wouldn't have hurt me to attend BAML Superday.