Jethro Tull, British progressive rock, are due to perform twice in Israel this summer. They published two dates in August, on the JT tour dates page of their official site:
But now, in their recnet update (June 8th), the Israeli gigs have disappeared altogether:

Since the Gaza Flotilla event, many rock bands have canceled their Israeli gigs. The biggest cancelation so far was The Pixies, two days before their show in June.
Are Jethro Tull joining the wave of Anglo-American rock bands, removing Israel from their tour dates? well, no. The gigs will happen as planned.
A quick email reply from the Jehtro Tull webmaster solves the mystery, regarding those two shows in Jerusalem (Aug-9) and Caesaria (Aug-7):
“we have stopped advertising them on our website due to a reaction from some fans”
This means that Jehtro Tull is hiding the fact that they are performing in Israel. The reason is obvious: people around the world are pressuring the band to pull the plug on Israel.
Not a good sign for us, Israelis. Actually, most Jethro Tull fans in Israel are opposed to the occupation. We’d love to see them again here.