A public hearing on a development plan for north Silver Spring will be held at 7:30 p.m. Dec. 1 in the auditorium of the Montgomery County Planning Board, 8787 Georgia Ave., Silver Spring. Persons who wish to testify should notify the community relations office by Nov. 30.

A seminar on recruiting, training and retaining associates for real estate sales managers will be held from 8:30 a.m. until noon Tuesday at the Tyson's Corner Ramada Inn. It is sponsored by the Northern Virginia Board o Realtors and fairfac County Public Schools Distributive Education Service.

The Fairfax County Board of Supervisors has approved a density change that will allow up to 180 single family detached houses to be built on a 79.8 acre tract near Dranesville Road and Hiddenbrook Drive.

The written license examinations for real estate brokers and sales agents in the District will be conducted starting at 8:30 a.m. Tuesday at the Quality Inn, 415 New Jersey Ave. NW.

A one-day seminar for secretaries who work in real estate offices will be conducted Nov. 30 from 9:30 a.m. to 3 p.m. at the Ramada Inn. 7801 Leesburg Pike, Falls Church. Sponsored by the Northern Virginia Board of Realtors, it will cover professional responsibilities, human and public relations, effective communications and increasing productivity.

A real estate license preparation course will be offered on four days starting Wednesday and continuing through Nov. 30, from 9 a.m. to 2 p.m. at the Stewart School, 2400 N. Underwood St., Arlington. Contact the Arlington Distributive Education Service, 1426 N. Quincy Street, Arlington, or call 558-2581.