Collocations for luncheon - noun

buffet
annual
awards
anniversary, business, literary (all esp. BrE)
charity, fund-raising

have
attend
organize
give, hold, host
The anniversary was marked by a luncheon given in the palace.

sponsor

menu
party (BrE)
address, speaker, speech

at luncheon
They met at a literary luncheon.

for luncheon
What's for lunch?

during luncheon, over luncheon (BrE)
I didn't talk much during lunch that day.
Garry told me this story over lunch yesterday.

Luncheon is used before these nouns:
meat, voucher

Luncheon is used after these nouns:
award