Back when Glynis Wein, Roy Thomas, Gerry Conway and Steve Englehart were all working at Marvel and Len Wein was at DC, they created an crossover of sorts that takes place at the Halloween parade in Rutland Vermont. Part 1 is told in Amazing Adventures #16 followed by Justice League of America #103 and then finishes up in Thor 207.
These pages are from Thor #207 showing the group at the parade