Step 1: Understanding the Question:
The question asks for the location of the first official summit of the Non-Aligned Movement (NAM).
Step 2: Detailed Explanation:
The groundwork for the Non-Aligned Movement was laid at the Bandung Conference in Indonesia in 1955.
However, the first official Conference of Heads of State or Government of Non-Aligned Countries, which is considered the first NAM summit, was held in Belgrade, which was the capital of Yugoslavia at the time.
This historic summit took place from September 1-6, 1961, and was hosted by the President of Yugoslavia, Josip Broz Tito, one of the founding fathers of the movement.
Step 3: Final Answer
The first Non-Aligned Summit was held in Belgrade.