Short answers, pulled from the story.
John Lennon and George Harrison arrived in Delhi on the 15th of February 1968. Paul McCartney and Ringo Starr landed later on the 19th of February and joined the retreat early on the 20th of February.
The facility sat in the Valley of the Saints within the Himalayan foothills above the River Ganges. The compound was surrounded by jungle and accessible via the Lakshman Jhula footbridge.
Lennon left after allegations surfaced that the teacher made a pass at Mia Farrow during private sessions. Alexis Mardas convinced Lennon to believe these claims despite no evidence, leading to a heated argument on the final night of the month.
The band wrote approximately thirty new songs between them in just weeks. This period became the group's most productive time for songwriting according to John Lennon.
The ashram site opened to the public in 2015 as the Beatles Ashram. A two-year exhibition titled The Beatles in India ran at Liverpool's museum starting February 2018.