The highlight for Arrowmen at the 1964 National Jamboree was the first Jamboree Order of the Arrow Pow Wow. 15,000 Arrowmen gathered together at the Valley Forge arena to hear featured speakers Founder E. Urner Goodman and former National Chief and current Chief Scout Executive Joseph Brunton, Jr. The event was described at the time as the largest ever gathering of Arrowmen and likely remains the largest such assembly to this day.

On the weekend of June 11-13, 1965 Unami Lodge hosted an Area 3A conference at Treasure Island. Part of the area conference program was the dedication of a plaque commemorating the 50^th Anniversary of the Order. Four hundred Arrowmen were on hand along with the Founders, E. Urner Goodman and Carroll A. Edson,  the Order’s first chief George Chapman and the Order's first Guide and Guardian of the Trail, Harry Yoder. The Plaque reads:

For the fifth time the OA returned to its most familiar setting for Conferences, Indiana University, for the NOAC celebration of the 50^th Anniversary of the Order of the Arrow. A record 4,237 delegates representing every state in the nation attended the Conference. There were greater than 1,000 Arrowmen more in attendance than any previous Conference. The fitting theme for the conference was chosen from the Ordeal Honor ceremony, “Mindful of our high tradition.”