Who was the architect of the hall built on the site of an August 1819 English massacre?
Free Trade Hall: The Free Trade Hall in Peter Street, Manchester, England, was a public hall constructed in 1853–56 on St Peter's Fields, the site of the Peterloo Massacre and is now a Radisson hotel. Free Trade Hall:  The architect was Edward Walters. Peterloo Massacre: The Peterloo Massacre occurred at St Peter's Field, Manchester, England, on 16 August 1819, when cavalry charged into a crowd of 60,000–80,000 who had gathered to demand the reform of parliamentary representation.
Edward Walters