I share everybody's concern for citizens of Gaza but I don't particularly like anti-Semitism being turned into a joke.
And whilst I hope most people recognise that Israel's blockade went too far and was too restrictive, since June Israel has allowed a much larger range of goods into Gaza - including food, toys, and cement for internationally monitored reconstruction.
The naval blockade (and remaining land blockade) is in place to prevent a route for arms shipments to Hamas, who have responded to the current round of peace talks by killing Israelis in a deliberate attempt to provoke the Israeli government. If Hamas are to be taken seriously as a government of Gaza they need to stop attacking random civilians in deliberate acts designed to prevent peace.
The route to peace is not through arming Hamas or by breaking the naval blockade that prevents arms and military support materials reaching Hamas.
I would also point out that this 'Open House' is not connected, as fas as I know, with the real Open House events happening across London on the same weekend, celebrating London architecture, including The Capitol and Louise House in Forest Hill.