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PHILADELPHIA FEB. 25 – March 2  AT ACADEMY OF MUSIC     Tickets ranging from $20 to $105.50 can be purchased by calling 215-731-3333 , online at kimmelcenter.org/broadway , at the Kimmel Center box office, Broad & Spruce Sts. (open daily 10 am to 6 pm) or at the Academy of Music box office, Broad & Locust Sts., (open during performances only).   Groups of 10 or more will receive discounts for select performances by calling 215-790-5883 or 866-276-2947 . Performances include : Tuesday - Thursday evenings at 7:30 pm; Friday & Saturday evening at 8:00 pm; Sunday evening at 6:30 pm; and matinees  Saturday at 2:00 pm and Sunday at 1:00 pm.      Leading the cast of 30 of MAMMA MIA! is Georgia Kate Haege as “Donna Sheridan,” the independent single mother whose carefree past catches up with her on the eve of her daughter’s wedding.  Bride-to-be “Sophie Sheridan” is played by Chelsea Williams; her fiancé “Sky” is played b...