Calendar of religious events

19 Apr Saturday Holy Saturday, Christian    
20 Apr Sunday Last day of Passover Jewish Holiday  
20 Apr Sunday Easter (for Orthodox, Catholic and other Christians)
21 Apr Monday Easter Monday
25 Apr Friday Yom HaShoah Jewish Commemoration 
1 May Thursday Beltane (Pagan)
1 May Thursday Yom HaAtzmaut Jewish Holiday  
12 May Monday Vesak (Buddhism)
16 May Friday Lag B'Omer Jewish Holiday  
29 May Thursday Ascension Day, Christian
2 Jun Monday Shavuot Jewish Holiday  
7 Jun Saturday Eid al-Adha (Tentative Date) Muslim  
8 Jun Sunday Pentecost, Christian  
9 Jun Monday Whit Monday, Christian  
14 Jun Saturday King's Birthday   
15 Jun Sunday Father's Day   
19 Jun Thursday Corpus Christi, Christian  
21 Jun Saturday Summer Solstice 
22 Jun Sunday Windrush Day   
27 Jun Friday Muharram/Islamic New Year (Tentative Date) Muslim    
6 Jul Sunday Ashura (Tentative Date) Muslim    
1 Aug Friday Luhnasadh (Pagan)
3 Aug Sunday Tisha B'Av Jewish Holiday  
15 Aug Friday Assumption of Mary, Christian  
15 Aug Friday Janmashtami (Smarta) Hindu Holiday  
16 Aug Saturday Janmashtami Hindu Holiday 
21 Aug Thursday Paryushana (Jainism)
26 Aug Tuesday Ganesh Chaturthi Hindu Holiday  
5 Sep Friday Milad un Nabi (Mawlid - tentative) Muslim 
22 Sep Sunday Autumn Equinox (Pagan) 
23 Sep Tuesday Rosh Hashana Jewish Holiday    
2 Oct Thursday Yom Kippur Jewish Holiday  
7 Oct Tuesday First day of Sukkot Jewish Holiday  
15 Oct Wednesday Simchat Torah Jewish Holiday  
21 Oct Tuesday Diwali/Deepavali Hindu Holiday  
26 Oct Sunday Daylight Saving Time ends
31 Oct Friday Samhain (Pagan)  
1 Nov Saturday All Saints' Day, Christian  
2 Nov Sunday All Souls' Day, Christian  
5 Nov Monday Guru Nanak Gurpurab (Sikh)
9 Nov Sunday Remembrance Sunday  
30 Nov Sunday First Sunday of Advent, Christian
30 Nov Sunday St Andrew's Day    
8 Dec Monday Feast of the Immaculate Conception Christian  
15 Dec Monday First Day of Hanukkah Jewish Holiday  
21 Dec Sunday Winter Solstice
21 Dec Sunday  Yule (Pagan)
24 Dec Wednesday Christmas Eve, Christian  
25 Dec Thursday Christmas Day
26 Dec Friday Kwanzaa begins (African-American culture)  
31 Dec Wednesday New Year's Eve  

Sources include 
https://www.timeanddate.com/holidays/uk/2025
https://en.wikipedia.org/wiki/2025_in_religion