Ian Hallard and Mark Gatiss attend the opening night of MAMMA MIA! The Party Photo

From: PHOTO/VIDEO: Go Inside Opening Night Of MAMMA MIA! The Party at The O2 With Björn Ulvaeus and More!

BroadwayWorld has a first look at opening night of Mamma Mia! the Party at The O2 London, on Thursday 19 September. Executive producer Björn Ulvaeus appeared during the show wearing his original ABBA costume from 1977 and welcomed guests including Mark Gatiss, Noel Fielding, Craig Revel Horwood and Arlene Phillips.