Straight from Mike over at The Forum:

G3 Mexico/South America - Joe Satriani, Eric Johnson & John Petrucci (w/MP)

Mon Oct 16th - Mexico City, Mexico - Teatro Metropolitan
Tues Oct 17th - Mexico City, Mexico - Teatro Metropolitan
Sat Oct 21st - Santiago, Chile - Velodromo Estadio
Mon Oct 23rd - Buenos Aires, Argentina - Stadium Luna Park
Tues Oct 24th - Buenos Aires, Argentina - Stadium Luna Park
Thurs Oct 26th - Porto Alegre, Brazil - Teatro de Sesi
Fri Oct 27th - Sao Paulo, Brazil - CreditCard Hall
Sat Oct 28th - Sao Paulo, Brazil - CreditCard Hall
Sun Oct 29th - Rio de Janeiro, Brazil - Claro Hall

G3 Australia - Joe Satriani, Steve Vai & John Petrucci (w/MP)

Wed Nov 29th - Brisbane, Australia - Brisbane Convention Centre
Fri Dec 1st - Sydney, Austraila - Hordern Pavillion
Sat Dec 2nd - Melbourne, Australia - Regent Theater
Sun Dec 3rd - Melbourne, Australia - Regent Theater
Mon Dec 4th - Melbourne, Australia - Regent Theater
Wed Dec 6th - Adelaide, Australia - Entertainment Centre
Fri Dec 8th - Perth, Australia - Challenge Stadium

Mike Portnoy joined Overkill on Sept. 30 during their set at the PNC Bank Arts Center in New Jersey to perform the song "Elimination".