Did that with Grand Funk playing London in '74, and with Alice playing London in '72, but being to far for the younger me to travel, and then them playing Glasgow in '73 but not London...!
Somewhat disgruntled to be in Scotland circa '77 when Doobies/Black Oak did a double header in London, and got back to discover the next gig was Glasgow... AAAAARRRRGHHHHHHHHH...!!!
Oh, and going to a drinking buddies younger brother's birthday bash and giving away a ticket to the first Blizzard of Oz tour... so never got to see Rhoads... rip...