Mensa was founded in Oxford, England on 1st October, 1946.
In some countries, Silver (25 years), Gold (50) and Diamond (60) anniversaries are perhaps better known than the 65th Brilliant anniversary - but how could Mensa ignore its own Brilliant anniversary?
Mensa groups around the world will be organising events, testing sessions and parties to celebrate, helping members and the public alike to understand more about Mensa, IQ and intelligence issues.
For Mensa Brillliant events, check out http://www.intelligenceday.org/en/intelligence-day/events/
Follow Mensa International on Twitter - @MensaInternatl - and hashtags #mensa65, #MensaBrilliant and #BrillianceDay.