Color Palette for Event Posters and Banners: 

1. Color Name: Royal Blue
   Hex Code: 
                            
                            #002366
                        
   Palette Description: A deep, rich blue that exudes elegance and sophistication. Perfect for highlighting important event details and creating a sense of grandeur.

2. Color Name: Sky Blue
   Hex Code: 
                            
                            #87CEEB
                        
   Palette Description: A light and airy blue reminiscent of clear skies. Provides a refreshing and calming effect, ideal for creating a soothing ambiance on event materials.

3. Color Name: Navy Blue
   Hex Code: 
                            
                            #000080
                        
   Palette Description: A dark, intense blue that brings depth and mystery to any design. Ideal for adding contrast and creating a sense of intrigue on event banners and posters.

4. Color Name: Baby Blue
   Hex Code: 
                            
                            #89CFF0
                        
   Palette Description: A soft and delicate blue that evokes feelings of innocence and purity. Perfect for conveying a sense of joy and creating a welcoming atmosphere for attendees.

5. Color Name: Turquoise
   Hex Code: 
                            
                            #40E0D0
                        
   Palette Description: A vibrant and tropical blue-green shade that adds energy and excitement to event materials. Ideal for promoting a lively and fun-filled atmosphere.

6. Color Name: Indigo
   Hex Code: 
                            
                            #4B0082
                        
   Palette Description: A deep, dark blue with a touch of purple. Evokes a sense of mysticism and elegance, making it a great choice for creating a classy and sophisticated event vibe.