Pentecost...Every Sunday? (Acts 2:1-4) John MacArthur

The events of Christ's life, death, and resurrection, according to Paul, were not held in a quiet corner (Acts 26:26) but out in the open before all the people. The same could be said of the birth of the church. It did not begin in an obscure manner in some out of the way place. Rather, it was born with a startling, dramatic event in the very heart of Jerusalem.

The coming of the day of Pentecost found the believers all together in one place, undoubtedly the same upper room described in 1:13. That room was located just inside the Eastern Gate, probably in the vicinity of the temple. There is no reason to restrict all to the twelve apostles. It encompasses the entire gathering of 120 believers (1:15)...