Here is a single color palette for a dog sport event system, featuring dark navy blue as the primary color:

1. Color Name: Dark Navy Blue
   Hex Code: 
          
          #000080
       
   Description: The primary color representing professionalism and authority in the dog sport event system. It conveys a sense of strength and reliability.

2. Color Name: Steel Grey
   Hex Code: 
          
          #808080
       
   Description: A secondary color that complements the dark navy blue. It adds a modern and sophisticated touch, enhancing the overall aesthetic of the system.

3. Color Name: Silver
   Hex Code: 
          
          #C0C0C0
       
   Description: Another secondary color that adds a touch of elegance and refinement. It works well as an accent color for highlighting important elements or creating visual hierarchy.

4. Color Name: Royal Purple
   Hex Code: 
          
          #6A0DAD
       
   Description: A vibrant and eye-catching color that adds excitement and energy to the system. It can be used sparingly to draw attention to specific elements or to create contrast.

5. Color Name: Forest Green
   Hex Code: 
          
          #228B22
       
   Description: A calming and natural color that represents the connection with nature in dog sports. It can be used for background elements or to evoke a sense of tranquility.

6. Color Name: Goldenrod
   Hex Code: 
          
          #DAA520
       
   Description: An accent color that adds warmth and a touch of playfulness to the system. It can be used to highlight important information or to bring attention to interactive elements.

This color palette creates a visually appealing and cohesive design for a dog sport event system, combining the professionalism of dark navy blue with complementary shades to enhance the overall user experience.