Dear Aunt Essy! Moving during annual festival? (6,6)

I believe the answer is:

easter sunday

I'm a little stuck... Click here to teach me more about this clue!

'festival?' is the definition.
(I've seen this before)

'dear aunt essy moving' is the wordplay.
'moving' is an anagram indicator.
'dear'+'aunt'+'essy'='dearauntessy'
'dearauntessy' is an anagram of 'EASTER SUNDAY'.

'during annual' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for easter sunday that I've seen before include "Focus of Christian festival" , "Holy day" , "Christian celebration of the Resurrection of Christ" .)

I've seen this clue in the Sydney Morning Herald.

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