This year Friday, May 21st is 40 days after Easter, which was April 12th.
This period and the number 40 in the bible are associated with prayer, purification and angels' protection.
The Ascension.
Sunday, May 31st is 50 days after Easter.
The number 50 in the Bible represents completeness or what is full. THe day following seven times seven sabbaths, is 49+1 or 50.
Pentecost.
Other anniversaries that cluster at the end of May:
May 29th is JFKs birthday
May 29th was when Robert Mueller held his 9:17 press conference
June 1st was when Napoleon died
June 2nd was Queen Elizabeth's coronation
June 14th is President Trump's birthday (two weeks from May 31st)