Geoff has brought up mass trespass songs on the April thread for Kinder but the largest mass trespass in England was Winter Hill in Lancashire on 6 September 1896 (although the people trespassed more than once).

Allen Clarke's song WILL YO’ COME O’ SUNDAY MORNING (known in several dialect variants, e.g. mornin') was published on thousands of song sheets for the 10,000+ trespassers and their supporters. I know a version is still sung but haven't yet found a recording online. Clarke was a well-known local writer and publisher of street literature and probably wrote other songs about events in Lancashire.

Will yo’ come o’ Sunday morning’
For a walk o’er Winter Hill?
Ten thousand went last Sunday
But there’s room for thousands still!

O the moors are rare and bonny
And the heather’s sweet and fine
And the roads across the hilltops –
Are the people’s – yours and mine!

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Link to the April SONGS ABOUT THE KINDER SCOUT TRESPASS /mudcat.org/thread.cfm?threadid=169449&messages=105#4169488:~:text=Subject%3A%20RE%3A%20Any%20April%20Songs%3F%0AFrom%3A%