The deadline for reservations at the convention hotel (AmericInn Monmouth) is Monday, March 14. There is another event in the hotel the weekend of the convention (4/1-4/3), and few other lodging options in the city of Monmouth.
The deadline for registration for the convention is Sunday, March 20. After the 20th a late fee will be assessed to all registrants.
See the Convention site for details.