The official language of the congress is English. However, an invitattion-only French event will follow the EDUsummIT2019, and reports its results. Details will soon be available at the following link: https://edusummit2019.fse.ulaval.ca/pages/bienvenue-sur-le-site-de-ledusummit2019.
We understand that you may need a visa for coming to EDUsummIT2019. Please have a look at here: http://www.edusummIT2019.fse.ulaval.ca/pages/visa-information
British citizens may only need an Electronic Travel Authorization. See https://www.gov.uk/foreign-travel-advice/canada/entry-requirements
To get an invitation letter, please fill the Invitation Letter Request Form that is at the following link: https://edusummit2019.fse.ulaval.ca/sites/iscar17.ulaval.ca/files/detailed_invitation_letter_request_form_for_visa_purposes.pdf
To go directly at the Government of Canada’s website: http://www.cic.gc.ca/english/visit/visas.asp