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Boxers Floyd Mayweather and Manny Pacquiao arrived in Las Vegas on Tuesday and participated in rallies attended by fans.  The showdown between the two top fighters, which has been years in the making, is expected to smash pay-per-view records, both in terms of buys and revenue.  For the crowds at the rallies, it is most likely the only chance to see the fighters ahead of the much-anticipated bout.  The MGM Grand Garden Arena, which has a capacity of 16,800, will be packed with big names with only 500 tickets offered for sale to the general public.  Undefeated Floyd Mayweather was welcomed by the Southern University marching band and thousands of fans, while Pacquiao greeted a smaller crowd of about a thousand.