The most common and most likely answer to this crossword clue is the 12 letter word CELEBRATIONS
I've seen this crossword clue in The Daily Telegraph
C
E
L
E
B
R
A
T
I
O
N
S
More clues leading to the result CELEBRATIONS
Buddy explains!
The straight part
We know that "special occasions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case special occasions = celebrations.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CELEBRATIONS mean?
CELEBRATIONS noun- The formal performance of a solemn rite, such as Christian sacrament.
- The observance of a holiday or feast day, as by solemnities.
- The act, process of showing appreciation, gratitude and/or remembrance, notably as a social event.
- A social gathering for entertainment and fun; a party.