Ray embraced men awkwardly on a particular Sunday (11,3)

I believe the answer is:

remembrance day

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'a particular sunday' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'ray embraced men awkwardly' is the wordplay.
'awkwardly' indicates anagramming the letters.
'ray'+'embraced'+'men'='rayembracedmen'
'rayembracedmen' with letters rearranged gives 'REMEMBRANCE DAY'.

'on' acts as a link.

Can you help me to learn more?

(Another definition for remembrance day that I've seen is " solemn occasion - with 26d".)

I've seen this clue in The Daily Express.

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