Calendar of religious events

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