2
Ramanavami ** - Hindu
4
Qingming //Ching Ming festival, Chinese Memorial Day or Ancestors' Day

5
Palm Sunday - Christian
6
Mahavir Jayanti ** - Jain

8
Hanuman Jayanti ** - Hindu
8
Hanamatsuri , Japon ( mahayana)Flower Festival (花祭 花祭 Khan Matsuri) is a festival dedicated to Buddha’s birthday.
9-13
Theravadin New Year ** - Buddhist
8-15
Pesach * - Jewish

8-9
Lailat al Bara'ah * - Islam
9
Maundy Thursday - Christian
10
Good Friday - Christian
12
Easter - Christian
Palm Sunday - Orthodox Christian
11-12
Lag B'Omer - Jewish
13-14
Baisakhi (Vaisakhi) - Sikh
14
Guru Nanak , Sikh
17
Holy Friday - Orthodox Christian
11
Lazarus Saturday - Orthodox Christian
19
Pascha - Easter - Orthodox Christian
19-20
First Day of Ridvan * - Baha'i
21
Yom HaShoah - Jewish

23
St. George's Day - Christian
23
Ramadan begins * - Islam
26
Akshaya Tritiya, Hindus and Jains.
27=28
Ninth Day of Ridvan - Baha'i

29-29
Yom Ha'Atzmaut * - Jewish
30
St. James the Great Day - Orthodox Christian
30
Buddha Bath Festival *
In China (current Mahayana), commemoration of the birth of the Buddha

https://www.calendarlabs.com/2020-hindu-calendar
http://www.calendrier-des-religions.ch/fetes.php?t=12
https://www.drikpanchang.com/calendars/vedic-calendars.html
http://www.interfaith-calendar.org/2020.htm