Each person non resident of the Russian Federation prior to applying for visa in the consulate must get an invitation according to the purpose of his or her visit.
Your Visa To Russia provides invitations for tourist and business trips.

Where to go on moscow city day

On September 4 the Russian capital celebrates its birthday with a series of parades and entertainment events. RT offers a list of events which you can enjoy during the celebration.

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Source: http://rt.com/prime-time/2010-09-03/where-go-moscow-day.html