Update README.md

Author: NathanTarbert

README.md

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 Check out the [Contributing guide](https://github.com/ag-ui-protocol/ag-ui/blob/main/CONTRIBUTING.md)
 
-- **[Weekely AG-UI Working Group](https://lu.ma/CopilotKit?k=c)**  
+- **[Bi-Weekely AG-UI Working Group](https://lu.ma/CopilotKit?k=c)**  
   📅 Follow the CopilotKit Luma Events Calendar
 
 ## Roadmap