The "Woman's Boat To Gaza" will launch from Barcelona on Sept 14 .
The two boats sailing from Spain are part of an effort in which supporters of Palestinians periodically launch "freedom flotillas" of mostly smaller boats and attempt to land in Gaza, Palestine, the coastal strip of land that along with the so-called West Bank constitutes what Palestinians still posses of historic Palestine.
The flotillas bring things like medications and building materials that Israel doesn't permit to enter Gaza but even in that are symbolic efforts to bring greater attention to the plight of Gaza, which usually only makes the news when the Israeli air force launches one of its periodic month-long bombardments of the Gaza Strip -- the most recent being in 2014 when more than 2,200 Palestinians were massacred while Israel, which controls the entrances and exits to Gaza, prevented anyone from fleeing, and while Israeli citizens watched from the surrounding hills in lawn chairs and ate picnic lunches.
The Flotillas often include a few prominent people like former congresswoman Cynthia McKinney or Greta Berlin, co-founder of the Free Gaza Movement, whose ability to draw media attention gets the effort more publicity. Israel, aware the flotillas damage their efforts to stealthily colonize the parts of Palestine they haven't already stolen via illegal settlements, has increasingly tried to prevent the flotillas from getting close to Gaza by intercepting them at sea and some of those encounters have been violent. In 2010, for example, Israeli commandos attacked a flotilla and killed 10 activists.
Joe Catron has an article about the Women's Flotilla in Truthout and an article about the flotillas in general here, and the women's flotilla web site is here.