October 2011, December 2012, March 2014 for starters. In other words, how often does a 31-day month begin on a Saturday? Fairly often.
A 31 days month starting on a Friday.
Once every 823 years
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Twice a week: Friday and Saturday, then they qualify Saturday and race on Sunday.
It happens when the month has 31 days and the 1st is a Friday. There are 7 months each year that have 31 days. There is a 1 in 7 chance that the 1st will be a Friday. So on average this happens once a year.
It doesn't result on how often you go to the city, but WHEN. I think its a random Saturday every month at 10:00 pm but I'm not sure.
The prior month means the previous month, or often said, "the month before".
December 11th will end on a Saturday around every 7 years.
Two (2) times in a month.
According to Wikipedia, the Eurovision finals are "traditionally held on a spring Saturday evening." It more often than not is held during the month of May. Read more about the Eurovision via the Related Link.
they come out every Saturday.