An event that involves a gathering of geezers. Often centred around a football match or other sporting event, a geezefest involves consumption of large amounts of alcohol and often recreational drugs.
A geezefest usually starts in a pub in the morning or early afternoon and continues until the participants are too mashed to continue the geezefest and have to return home. Geezefests invariably involve banter between geezers and sometimes a fight.
Who was at the football yesterday?
All the lads, it was a proper geezefest.