For the NC$$ East Regional in Providence, you can either buy tickets directly
at the Providence Civic Center box office or at Providence College, or if
you wish to buy by phone, you can call Ticketron at 1-800-382-8080.  If you
buy by mail, I believe you can only buy the package (Thur & Sat).  Cost
is $30 for both nights (i.e $15 a night).  I was told that Ticketron has
nearly sold out of the packages and you may not be able to get two or
more seats together, so be warned.
 
Dates again are Thur March 26 & Sat March 28, times are 5 & 8 pm each day.
The PC box office can be reached at 401-865-2271; I don't have the Civic
Center # but if you need to call them, try information at 401-555-1212.
 
For the West, packages are $40 and the number at the Joe is 313-567-7500.
Dates are Fri Mar 27 and Sun Mar 29 in Detroit.