Apply suggestion from @benjie

Author: benjie

src/pages/blog/2025-10-14-announcing-ai-wg.mdx

@@ -22,7 +22,7 @@ Like all GraphQL working groups, this one is **open to everyone**. Whether you
 👉 Get involved:
 
 * Follow updates on the [GraphQL GitHub](https://github.com/graphql)
-* [Subscribe](calendar.graphql.org) for community calendar invites 
+* [Subscribe](https://calendar.graphql.org) for community calendar invites 
 * Bring your ideas and feedback to help shape the group’s work 
 
 AI is transforming software development, and GraphQL is uniquely suited to make AI systems more accessible and connected. We can’t wait to see what we’ll build together.