March/April 1976
Wizard's Convention  
People involved
Tony Ashton (pno/vcl); Les Binks (drm); David Coverdale (vcl); John Crocker (sxp); Ray Fenwick (gtr); Mo Foster (bss); Roger Glover (bss); Eddie Hardin (vcl/msc); Jimmy Helms (vcl); Glenn Hughes (vcl); Ric Lee (drm); Rick van der Linden (pno/msc); Jon Lord (pno); Mark Nauseef (drm/prc); John Slaughter (gtr); Henry Spinetti (drm); Pete York (drm); the Chris Barber Band (msc).
Eddie Hardin initiated a jazz-rock-ish session; Lord was there.

Albums & singles
Wizard's Convention [lp] : UK Dec 1976 Purple
Wizard's Convention [lp] : Germany 1976 RCA Records PPL1-8118
Wizard's Convention [lp] : US? 1976 RCA Records RS 1085
Wizard's Convention [cd; extra material] : Germany 1994 Repertoire REP-4474-WY
Butterfly Ball - Wizard's Convention [cd] : UK 1989 Connoisseur VSOP CD 139
Butterfly Ball - Wizard's Convention [cd] : Japan 199- Teichiku TECW-30211-2

Material from above appears on...
Wizard's Convention III [cd] : Japan January 1997 TDK Records International TDCN-5615