We
were out on the town last night for Valerie's
birthday, that's why we're all exhausted today.
La expresión
to go out on the town, aunque pudo originarse a
comienzos del siglo XVIII, no llegó a ser popular hasta
la aparición del musical On the town (1944) que
incluía canciones tan conocidas como New York, New
York, y que más tarde (en 1949) dió lugar a una
película musical con el mismo título.
The origin of the phrase is unclear. It might have
originated in the early 1700s in other forms, but
was not very popular. It gained popularity in the
mid 1900s, after a stage show called "Out On The
Town" was performed in 1944 and a film by the same
name came out in 1949.
https://www.theidioms.com/out-on-the-town/