Childrens Festival 1912
The pictures are of the Childrens Festival which took place on September 14th 1912 on the green at the Circle behind the Moor Pool Hall. The green is now the tennis courts for the Circle Tennis Club.
In picture 1 the building at the back is Harborne Tenants Estate office with the snooker and billiards club on the first floor with bay window.
The pictures show the circle has screens around the outside so presumably you had to pay to attend and watch the performances.