Macy's Thanksgiving Day Parade (1963)
The 1964-65 New York World's Fair was held in Flushing Meadows Park in Queens. The upcoming event was promoted at the 1963 Macy's Thanksgiving Day Parade.
This photo of the Unisphere Float isn't quite as clear, but it does show a massive billboard for Johnny Walker Scotch. Drink up, my friends, and Happy Thanksgiving!