Given the below context:  Against this background, a "great assembly" was organised by the Manchester Patriotic Union formed by radicals from the Manchester Observer. The newspaper's founder Joseph Johnson was the union's secretary. He wrote to Henry Hunt asking him to chair a meeting in Manchester on 2 August 1819. Johnson wrote: Nothing but ruin and starvation stare one in the face [in the streets of Manchester and the surrounding towns], the state of this district is truly dreadful, and I believe nothing but the greatest exertions can prevent an insurrection. Oh, that you in London were prepared for it. Unknown to Johnson and Hunt, the letter was intercepted by government spies and copied before being sent to its destination. The contents were interpreted to mean that an insurrection was being planned, and the government responded by ordering the 15th Hussars to Manchester. The mass public meeting planned for 2 August was delayed until 9 August. The Manchester Observer reported it was called "to take into consideration the most speedy and effectual mode of obtaining Radical reform in the Common House of Parliament" and "to consider the propriety of the 'Unrepresented Inhabitants of Manchester' electing a person to represent them in Parliament". The magistrates, led by William Hulton, had been advised by the acting Home Secretary, Henry Hobhouse, that "the election of a member of parliament without the King's writ" was a serious misdemeanour, encouraging them to declare the assembly illegal as soon as it was announced on 31 July.   The radicals sought a second opinion on the meeting's legality which was that "The intention of choosing Representatives, contrary to the existing law, tends greatly to render the proposed Meeting seditious; under those circumstances it would be deemed justifiable in the Magistrates to prevent such Meeting."On 3 August, Hobhouse conveyed the view of the Attorney-General that the magistrates were incorrect to declare 9 August meeting illegal as it was called to consider the election of a representative and...  Guess a valid title for it!
A:
Peterloo Massacre