James MacCleary, the campaign director of European Movement UK, said: "The pro-European movement is gaining in strength and momentum, and that progress will be reflected this weekend with a huge demonstration of grassroots power in favour of a people's vote on the Brexit deal".
The People's Vote campaign was launched today in North London in an attempt to unite a range of separate anti-Brexit activists.
The day of action is being organised by the European Movement, Open Britain and Britain for Europe, with more than 100 events planned across the United Kingdom, from Aberdeen to Falmouth.
Green MP Caroline Lucas will say: "We will be making the case in Parliament, but this is too big and too important to be determined exclusively by politicians".
The actor, famous for his roles in Star Trek and X-Men, even said his fictional character Charles Xavier would have supported the Remain campaign.
According to Sir Patrick Stewart, who is leading the effort, the campaign's goal is to secure a referendum on the final Brexit deal.
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Foreign Secretary Boris Johnson ridiculed the campaign, pointing out that the people's vote has already taken place.
He added that "history and emotion" led him to want to stay in the EU.
'When the United Kingdom and Ireland were brought in I felt for the first time in my life that the brutality of both World Wars could never happen again'.
He said: "They voted with a substantial majority to leave the EU".
Asked what he would say to people who voted for Brexit, he told the programme "what we are doing is in their benefit".
Foreign Secretary Boris Johnson countered with a Star Trek allusion of his own, promising that Britain's departure from the European Union will allow it "to boldly go again to areas that perhaps we've neglected over the last 45 years".
Barnier noted that British Prime Minister Theresa May assured the EU London would not engage in a race to the bottom in environmental protection and that her words were reflected in Britain's proposed 25-year plan on the environment.