versions of a love song in Scottish Gaelic, THA MO RÚN AIR A’ GHILLE refer to Oídhche Shamhna, which is Hallowe'en night.
https://mudcat.org/thread.cfm?threadid=171787

Oidhche Shamhna ghabhas mi òran,
Nam b’aite leam dhèanainn òran;
‘S truagh a Righ nach mi bha pòsd’
Aig òigear a’ chùil dualaich.

(I’d sing my song on Halloween;
If I could I would compose one;
It’s a pity that I am not married
To the youth with the curly hair.)

or, as sung by Mary Jane Lamond https://www.youtube.com/watch?v=8U3OYYgWnYI:

Oidhche Shamhna dhomh 's mi m'ònar         
Smaointich mi gun dianainn òran
'S truagh a Rìgh nach mi bha pòsd'         
Ri òigear a' chùil dualaich

(Alone on Halloween night
I thought I would compose a song
It's a pity I wasn't married
To the yout2h with the curly hair)

Anna Murray https://www.youtube.com/watch?v=-wzCYz3OVx0 sings instead of a summer night; it would be easy to sing "Oidhche Shamhna" instead of "oidhche shamhraidh"!

Oidhche shamhraidh dhomh 's mi'm ònar         
Air mo ghaol sa ni mì òran         
'S truagh a rìgh, nach robh mi pòsd         
Aig òigear a' chùil dualaich

(Alone on a summer night
I will make a song about my love
It's a pity I wasn't married
to the youth with the curly hair)