Arms Fair. The UK government always invites Saudi Arabia to send a military delegation to the fair, where it can browse weapons from most of the world's major arms companies.
It is best known for its airshow but its main purpose is the combined arms fair and civil aerospace exhibition. The family-friendly airshow and "Futures Day" event allow weapons manufacturers a unique PR opportunity.
https://www.caat.org.uk/issues/arms-fairs/farnborough