The most people wearing Groucho Marx glasses was achieved by 4,436 participants in an event organised by the City of Chicago’s Outdoor Film Festival in partnership with the Goodman Theatre in Chicago, Illinois, USA, on 21 July 2009. The event started at 5:00 pm and finished at 8:33 pm
The most people wearing costume masks was 27,080, and was organised by Angels Baseball (USA) at Angel Stadium in Anaheim, California, USA, on 10 May 2011. Wrestling masks with the Angels logo were handed out to everyone who attended the baseball game. The stadium had an attendance of 31,773 for the evening, although ushers counted 4,693 people not wearing their masks.
The world record for the most people wearing balloon hats was 4,017 at the Utah Summer Games Opening Ceremony in Cedar City, Utah, United States on 14 June 2007.
The most people watching TV underwater was achieved by 114 participants in an event organised by Wet Wrecks at Underwater Studios in Basildon, UK, on 1 April 2009. The participants watched England’s World cup qualifier vs. Ukraine.
The most people washing their hands is 37,809 at an event organised by Lifebuoy Team and the federal government of Nigeria at TBS Onikan in Lagos, Nigeria on 14 October 2011. The record was held to encourage children to wash their hands with soap and water to defeat diarrhea.
The largest simultaneous walk was organised by the Green Communities Canada and involved 231,635 participants who walked for a minimum of 1 km (0.62 miles) at 1,011 different locations around Canada on 3 October 2007.
The most people wearing the same full team kit was 537 for an event organised by SWATCH in Stare Jablonki, Poland on 8 September 2007.
The most people wearing sunglasses in the dark is 1,675 and was achieved by Gilda’s LaughFest (USA) in Grand Rapids, Michigan, USA, on 6 March 2014.
The most people wearing red noses in multiple locations is 89,116 in an event organised by CliniClowns Nederland, Netherlands, on 9 November 2007.
The most people wearing paper hats is 3,045 and was achieved by SCOUTS New Zealand (New Zealand) in Manfeild Park, Feilding, New Zealand, on 1 January 2014. SCOUTS New Zealand broke this record at their 20th New Zealand Scout Jamboree, which occurs every three years, and includes scouts and leaders from New Zealand, Cook Islands, Australia, Korea, Tonga and Samoa.