Who are the other guitarists with John Mayer on the Continuum Tour?

Answer 1

Steve Jordan and Pino Palladino

Answer 2

This is next to impossible to answer. They may be people he usually works with, as listed in the credits below from the Continuum CD, but if any musician cannot make a tour date, musicians often substitute with a local person or studio musician they may have worked with before.

Each date of the tour may include different people, so it would take a whole lot of research to find out who played what on each date.

Here are the credits from the CD:

Larry Goldings (Keyboards), Roy Hargrove (Horn), Ricky Peterson (Piano), Ricky Peterson (Keyboards), Willie Mitchell (Engineer), Willie Mitchell (Horn Arrangements), Michael Brauer (Mixing), Greg Calbi (Mastering), Joe Ferla (Engineer), Jack Hale (Trombone), Nathaniel Kunkel (Digital Editing), Manny Marroquin (Mixing), Jamie Muhoberac (Keyboards), Dave O'Donnell (Engineer), Pino Palladino (Bass), Pino Palladino (Vocals), Bryant Pugh (Digital Editing), Bryant Pugh (Assistant Engineer), Lester Snell (Organ), Lester Snell (Fender Rhodes), Lester Snell (Horn Arrangements), Willie Weeks (Bass), John Alagía (Engineer), Art Smith (Drum Technician), Lannie McMIllian (Sax (Tenor)), William Paden Hensley (Mixing Assistant), Jeri Heiden (Art Direction), Mark Seliger (Photography), Martin Pradler (Digital Editing), Sam Erickson (Photography), John Mayer (Vocals), John Mayer (Producer), John Mayer (Art Direction), John Mayer (Photography), Brian Montgomery (Digital Editing), Brian Montgomery (Assistant Engineer), Chad Franscoviak (Engineer), Chad Franscoviak (Photography), Ken Helie (Production Coordination), Steven "Steven J." Jordan (Percussion), Steven "Steven J." Jordan (Drums), Steven "Steven J." Jordan (Vocals), Steven "Steven J." Jordan (Producer), Peter Doris (Digital Editing), Peter Doris (Assistant Engineer), James Valentine (Guitar), Glen Nakasako (Art Direction), Jim Monti (Assistant Engineer), Chalmers "Spanky" Alford (Guitar), Jared Robbins (Mixing Assistant), Dan Monti (Assistant Engineer), Kristen Moss (Vocals), Jared Nugent (Assistant Engineer), Angie Teo (Digital Editing), Angie Teo (Assistant Engineer), Vanessa Parr (Assistant Engineer), Ben Carley (Trumpet), Scotty Crowe (Vocals), Ricky Cytonbaum (Vocals), Jim Mahorn (Sax (Baritone)), Harley Pasternak (Vocals), Maggie Slavonic (Vocals), Sandy Vongdasy (Vocals), René Martínez (Guitar Technician)

Kabum