Remove nonlinear call

Author: odow

pages/calendar.md

@@ -10,10 +10,6 @@ This page collates upcoming events related to JuMP.
    at 14:00 Eastern time. The call is open to all community members. For a
    calendar invite and access to the Zoom link, join the [developer chatroom](/chatroom)
    and ask `@odow` for an invite.
- * There is a monthly call focused on nonlinear programming on the second
-   Wednesday of each month. The call is open to all community members. For a
-   calendar invite and access to the Zoom link, join the [developer chatroom](/chatroom)
-   and ask `@frapac` for an invite.
 
 ## JuMP at conferences