This is the best summary I could come up with:

Thousands of people rallied in Budapest on Saturday as a political newcomer led a push to mobilise voters against Hungary’s populist prime minister, Viktor Orbán, ahead of European elections on Sunday.

“We defeated apathy,” declared Péter Magyar, a former government insider who switched sides and launched an opposition movement, as he stood in front of a vast crowd which filled the capital’s Heroes’ Square.

Magyar, who used to be married to Orbán’s former justice minister, became a sensation in Hungary earlier this year when he broke ranks and began criticising the government, stressing concerns about alleged corruption.

The political newcomer’s informal style, social media savvy, and willingness to criticise both right-wing and left-wing politicians has resonated with many voters.

“What is completely new is that he can speak essentially to the whole left-liberal side and also a significant segment of Fidesz voters,” said Róbert László, an election expert at the Budapest-based Political Capital Institute.

“Magyar’s appearance means a serious threat for everyone: obviously now much more for the opposition parties than for Fidesz,” László said, adding: “We don’t expect that Orbán will be packing his bags on 10 June.”

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