Which event is associated with the 3rd National Convention of the FFA?

The adoption of the FFA creed is indeed associated with the 3rd National Convention of the FFA. This creed, written by E.M. Tiffany in 1930, embodies the principles and beliefs that guide the organization and its members. The creed serves as an introduction to the values and aspirations of the FFA, emphasizing the importance of agriculture, leadership, and community service. Its formal adoption at this particular convention was a significant step in solidifying the identity and mission of the FFA at a national level, making it a pivotal moment in the organization's history.

Other events may have played important roles in the FFA's development, but the formal adoption of the creed is specifically highlighted as a key milestone from the 3rd National Convention.