Past and present pupils, as well as children from Oban high's feeder primary schools, are invited to join the attempt, donning a wand, glasses, Gryffindor tie and painted forehead scar on Monday March 26 at the school's all-weather pitch.
Sixth-year pupil Lewis Buchanan explained: 'Oban High School has stood on this ground for more than 100 years. However in April 2018 we are moving into a new building on a different site and the building we are currently in will be demolished.
'We thought it would be a good idea to mark the last day of being in this building with an event. We thought a world record attempt was a fitting tribute and, as Harry Potter is arguably the greatest school story ever written, we would like to try and break the record of the most people dressed as Harry Potter.
'We are also going to do some fundraising for some of our additional support needs pupils who are going on a trip, by selling butterbeer and Bertie Botts Beans.'
Another organiser, teacher Aisling Clark, said: 'The current record is 676. We hope to get 1,000. We need volunteers to steward it on the day. The wand and tie are easily made from paper and we are selling glasses for £1.'
Ms Clark had even spent £20 of her own money buying 1,000 chopsticks to turn into magic wands.
'Any funds made on the day will be given to HCPT,' she added. 'This charity takes children away every Easter. These children are either additional support needs, young carers or have health problems and this may be the child’s first experience away from their family. It offers respite for families and particularly young carers.'
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