Each year, I try to do something significant on my birthday. On Sunday (my birthday) I attended a bicycle racing skills clinic that counted toward my upgrade from Cat 5 to Cat 4. My upgrade to Cat 4 was approved today by USA Cycling / NCNCA.
The clinic was a lot of fun. We focused on pack skills learning how to ride in close proximity, bump someone's rear wheel and not crash, proper attack through turns, riding through turns at speed with two and three abreast and slower speed (but faster than you think possible) U turns around cones. It was great review and one always learns something new.
I would encourage all performance / group riders or racers to take skills clinics. They are a great way to improve your cycling and make you a safer rider.