I am trying to deal with this same issue, but I am not able to get the
crash report.  I get the gnome panel, and all is fine.  But when the
calendar dropdown is activated, it crashes, then restarts.  But the
crash does not occur until you click on the calendar.  So, I tried to do
the back trace that was asked for.  But, if I stop the panel, it just
restarts because the sesson restarts it.  If I shut down the session,
well....

So, I tried to alter the debug command as follows:
    gdb --pid=3170 2>&1 | tee ~/gdb-gnome-panel.txt

This locks up everything until the debugger is stopped.  No clicks are
getting registered, therefore, the crash is being blocked by the program
that will identify the crash.... Ouch

So, I tried a strace instead to see if it could give you something useful, and 
it seems to have hit pay dirt.  What I did was:
     strace -p 3170 2>gnome-panel.strace

Attached it the output.  it clearly identifies the crash, and it is
occuring in the calendar-client.c.

Hope this helps

** Attachment added: "strace output showing crash"
   http://launchpadlibrarian.net/34982957/gnome-panel.strace

-- 
gnome-panel assert failure: 
ERROR:calendar-client.c:1309:calendar_client_handle_query_completed: assertion 
failed: (source->query_in_progress != FALSE)
https://bugs.launchpad.net/bugs/438182
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