Is it possible to "freeze" agenda from changes 12 prior to meeting start

Our club officers are concerned that members might cancel role(s) upon receiving the email agenda, as the "drop" buttons on the agenda make it easy to cancel a role. 

QUESTION:  Is it possible to set a cancellation deadline?  For example, no changes to the agenda can be made 12 hours before the meeting starts.  In this way, members who do need to cancel could contact the Toastmaster, VP Ed or President, verses cancelling a role because it is "easy to do" when receiving the agenda.

Thanks for your input.

 

No you cannot freeze an agenda.
You also can't make a member do a roll.

I think your officers have to rethink how they motivate people to take roles.