Most likely: Fridays. Least likely: Saturdays (MC) Schooldays (William) for paired bowling sessions.

Bowling sessions: Which days of the week are most likely to have paired bowling sessions (Both MC and William in the alley); William; MC/Moscovio; Typically unavailable on: Saturdays Typically available on: Sundays, Wednesdays and Fridays; Typically unavailable on: Mondays, Tuesdays and Thursdays. Typically available on: Fridays