For a period of time , it held a place in the `` Guinness Book of Records '' as the largest outdoor `` rock concert '' in history , with figures varying Change from 1 to 1.5 million in attendance .

It was previously called Name_conferral Witnness , which ran Being_in_operation from 2000 and was sponsored Supply by Guinness .

On 15 February 2003 , a month before the invasion Attack , there were worldwide protests Judgment_communication against the Iraq War , including a rally Social_event of three million people in Rome , which the Guinness Book of Records listed Recording as the largest ever anti-war rally Social_event .

It is also recognized Know as the highest-grossing music tour per concert Social_event in the 2007 edition of the `` Guinness World Records '' .

Summerfest attracts Influence between 800,000 and 900,000 people each year , promoting Cause_change_of_position_on_a_scale itself as `` The World 's Largest Music Festival '' , a title certified Check by the Guinness World Records since 1999 .

In 2010 , World Maths Day created Creating a Guinness World Record for the `` Largest Online Maths Competition '' .

Guinness official Syeda Subasi-Gemici , adjudicator of Guinness World Records Ltd. , presented Presence the certificate validating Check the attempt .

Guinness official Syeda Subasi-Gemici , adjudicator of Guinness World Records Ltd. , presented Presence the certificate validating Check the attempt .

Arthur 's Day was an annual series of music events Social_event worldwide , originally organised Arranging by Diageo in 2009 to promote Cause_to_make_progress the 250th anniversary of its Guinness brewing company .

It was named Name_conferral after the founder of Guinness brewing , Arthur Guinness .

It was named Name_conferral after the founder of Guinness brewing , Arthur Guinness .

€6 million was pledged Commitment to the Arthur Guinness Fund at the time .

Guinness drinkers were asked Request by the brewing company to raise Self_motion a glass to the memory of Arthur Guinness at 17:59 ( 5:59 pm ) , a reference to 1759 , the year the Guinness Brewery was established Creating .

Guinness drinkers were asked Request by the brewing company to raise Self_motion a glass to the memory of Arthur Guinness at 17:59 ( 5:59 pm ) , a reference to 1759 , the year the Guinness Brewery was established Creating .

Guinness drinkers were asked Request by the brewing company to raise Self_motion a glass to the memory of Arthur Guinness at 17:59 ( 5:59 pm ) , a reference to 1759 , the year the Guinness Brewery was established Creating .

An 82c stamp of an Arthur Guinness portrait was also released Publishing by An Post to commemorate the anniversary .

The last Arthur 's Day was held Hold in 2013 with Guinness cancelling Removing the event Social_event in 2014 .

A new music programme to help Assistance emerging artists in Ireland called Name_conferral `` Guinness Amplify '' was launched Process_start to replace the event Social_event

According to `` Guinness World Records '' , this was the largest ever parade of boats , surpassing Cause_change_of_position_on_a_scale the previous record of 327 vessels set Placing in Bremerhaven , Germany , in 2011 .

The Montreal Jazz Fest holds Hold the 2004 Guinness World Record as the world 's largest jazz festival .