The Ministry of Justice has now responded that the specific event in question was not researched by them as the petition came in too close to the event to allow such treatment. That being said, the MoJ says that there is no discrimination against men in Israel, so an event that excludes men is not "hadara" - men do not suffer from being excluded. While men are not excluded or banned, from the public sphere, women do suffer greatly from this, so events excluding women are a strong offense. That is why female-only events can happen but male-only events (from public funding) are a problem.
Personally I think of this like affirmative action. African Americans in the USA, or Hispanics or other minorities, get priority in hiring or acceptance into schools, because they have been discriminated against for so long and have suffered from the discrimination. Whites do not suffer from such discrimination, so occasionally they get the short end of the stick but have to live with it. In Israel, the Haredi askanim fight for affirmative action for hiring Haredim in government jobs, Arabs get affirmative action in acceptance to universities and specifically medical school. The average Jew (male I guess) in Israel is not discriminated against, so even though affirmative action means occasionally the average jew might get the short end of the stick, that is not discrimination, or hadara.
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