On Saturday morning the Course Stewards meeting is at 7am. Drivers meeting is usually at 7:10am. Racing starts sometime soon after (7:30am ish). On Friday and Sat evening the course walk starts at 4pm (Nov meet only), as it gets dark early.
Racing continues on Sat till the course gets munched up (depending on weather, but trying to get all 1st round through at least), but from what I've seen, it closes earlyish on the Sat so they can moved the course in daylight.
It is light about 6am at the lake. Remember daylight saving started last week. Cold but beautiful weather.
MM