Question: How many gatherings take place every Sunday at the church that Pascoe St Leger Grenfell donated an acre of land for?

Related documents: [0]  [DOC] Pascoe St Leger Grenfell (1798–1879) was a British businessman and patron, and a key backer of the South Australian Company. He was a valued committee member of the South Australian Church Society, and, among other things, he is known for the donation of an acre of land on North Terrace, Adelaide which was used for the construction of the Holy Trinity Church — one of the first churches built in the city and the colony. He also donated 40 acres of land for the use of the church as glebe lands. This land later became the suburb of Trinity Gardens. The significant city street Grenfell Street, Adelaide was named after him. [END] 
[1]  [DOC] Trinity City (also known as Holy Trinity Church Adelaide, and originally named Trinity Church), is an evangelical Anglican church located at 88 North Terrace, in the city of Adelaide, South Australia. Trinity City has four gatherings at the North Terrace location each Sunday, as well as various other meetings throughout the week. [END]  
Answer: four
four