So far, Activision's been clearing the hurdles to the merger nicely, and executives from both companies seem pretty excited about the deal, so It seems unlikely that the shareholders will balk too much (then again, there is that lawsuit).
The timing of this meeting is apparently later than expected according to sister site Big Download, but it is worth noting that it still beats out E3, which will take place on July 11th-13th. You'll recall that Blizzard and Activision dropped out of E3. Rumor has it that they are also planning to hold a press conference during E3, on the first day, and being able to reveal final details of when, where, and how the merger will complete during that press conference would be quite a coup, for sure.
[Via Big Download]