Can you find the lurking Christian festival?

Across

6 Obstruct precentor’s seat? (5)

7 I’m surrounding church with exceptional care — I may need wafers (3,5)

10 Gut warning following bad upset (7)

11 Survive dawn-to-dusk time of judgement (4,3)

12 Bishop quiet about row (7)

13 One guise sadly not superior or elegant (7)

14 Criminal organised a brawl, ensnaring English monarch (3-8)

19 Democrat having old slave on landed estate (7)

21 Herald was one complete achievement (7)

23 Stage hand in favour of getting bit of money in bowl (7)

25 Deduce limited number will be in 4 (7)

26 Increasing stink involving old university and holy books (8)

27 Paint darts line about right (5)

Down

1 Church dignitary giving a description of two or three? (8)

2 Some calumnious former students (6)

3 More than one score heard after holy canon uncovered instrument (10)

4 Loveless greeting is cause of misery (4)

5 Discourage old nurse embracing a theologian (6)

6 Sabbath affected island seafood (6)

8 Composer angry having lost opening in Italy (7)

9 Ignoring the odds, they appear over-excited (5)

13 Samples old sweetened drinks, being full of affected talk (10)

15 Victorian 1, bearer of a gift? (7)

16 Old city hospital in guessing game after work (8)

17 Girl before gym gets to change (5)

18 Hotel with collection of treasure around did well (6)

20 Jersey maybe for a child (3-3)

22 Something entering that’s inferior and mean (6)

24 Unworldly openings for new and innocent followers (4)

Last week's solution