In Mike Love's group, Christian Love joined as a second rhythm guitarist for a show in 2004.

I'm not sure if this has been mentioned yet, but Andy Paley filled in for Darian Sahanaja at a show in late 2002 after Mike D'Amico returned to the group.

Another one-shot fill-in in Brian's group was Robby Scharf, who filled in on bass for Bob Lizik in 2007.

Musicians that were in Brian Wilson's touring band only in select shows in 1999 were Steve Dahl on rhythm guitar, percussion, and vocals, Chuck Solmar on percussion and vocals, and Jim Peterik on rhythm guitar and vocals.

It could be Joe or Ernie or even someone we don't even know about that was a one-shot fill-in.

Andrew Clark played sax for Mike's group at shows in New England in 2014 and 2015 before Randy Leago joined the group in 2016.

I did see a post or two from Mike Love at a concert back in February of this year where Jeff Foskett was an extra rhythm guitarist. Ike moved into Jeff's spot in rhythm guitar and Jeff became an occasional third rhythm guitarist.

As for Brian Wilson's group, Casey McDonough subbed for Matt Jardine at some shows in 2017, Nelson Bragg left in 2018 and was replaced by Jim Laspesa, and Rob Bonfiglio subbed for Matt Jardine in late 2018. Nicky Wonder passed away in August 2019 and was replaced by Randell Kirsch later that month. Rob Bonfiglio then replaced Kirsch in September 2019.

For Mike Love's group, Paul Fauerso subbed for John Cowsill at AVO Session in Switzerland in 2003 and Brian Sutherland subbed for Christian Love in late 2013. Are there any other one-shot subs that there have been over the years?