Uncertain if is the 19th or the 20th. NME states both.

NME Magazine, 21st May 1988 - gig guide page 43

NME Magazine, 30th April 1988 Page 43 news item:

FAITH NO MORE have added three dates to their forthcoming British tour and have changed the details of two others. The extra shows are at Leeds University (May 16), Liverpool Royal Court Theatre (17) and Norwich UEA (20) while the Glasgow show on May 14 is now at QMU and the date of the Birmingham Hummingbird show has been changed to May 19.