While color coding events on an online calendar can be visually appealing and helpful for some users, it may not meet accessibility requirements for all users. Vega Program is designed with WCAG 2.1 AA guidelines in mind. Here are some reasons:

• Color Perception : Not all users perceive colors in the same way. Color      blindness affects approximately 1 in 12 men and 1 in 200 women globally.      Using color as the only visual means of conveying information could make      the calendar less accessible for these users.
• Contrast Sensitivity : Some users may have low contrast sensitivity, meaning      they struggle to distinguish between colors that do not contrast strongly.      If the color coding does not provide sufficient contrast, these users may      find it difficult to differentiate between events.
• Accessibility Guidelines : The Web Content Accessibility Guidelines (WCAG)      recommend that color should not be used as the sole method of conveying      content or distinguishing visual elements. This is to ensure that users      who are unable to perceive color can still understand the content.
• Cognitive Load : Relying on color coding could increase cognitive load      for users as they would need to remember what each color represents. This      could be particularly challenging for users with cognitive impairments.
• Device Variability : Colors can appear differently on different devices      due to variations in screen technology and settings. This could lead to      confusion if an event appears to be color-coded differently on different      devices.

Instead of relying solely on color coding, it is considered more accessible to use a combination of methods to distinguish between different events. Vega Program uses a mix of icons and filtering on the staff side to ensure that the calendar is accessible to all users, regardless of their visual abilities.