Article: In late summer he was invited by Jane Stirling to visit Scotland, where he stayed at Calder House near Edinburgh and at Johnstone Castle in Renfrewshire, both owned by members of Stirling's family. She clearly had a notion of going beyond mere friendship, and Chopin was obliged to make it clear to her that this could not be so. He wrote at this time to Grzymała "My Scottish ladies are kind, but such bores", and responding to a rumour about his involvement, answered that he was "closer to the grave than the nuptial bed." He gave a public concert in Glasgow on 27 September, and another in Edinburgh, at the Hopetoun Rooms on Queen Street (now Erskine House) on 4 October. In late October 1848, while staying at 10 Warriston Crescent in Edinburgh with the Polish physician Adam Łyszczyński, he wrote out his last will and testament—"a kind of disposition to be made of my stuff in the future, if I should drop dead somewhere", he wrote to Grzymała.

Question: What city did Chopin perform at on September 27?
Glasgow