A plan to ban “frequent and large gatherings at neighborhood homes” is a lawsuit waiting to happen, a Fairfax County supervisor predicts.  Officials will get an idea Wednesday when public-comment hearings begin in Virginia’s most populous county.  “I believe the county is risking a lawsuit and/or a Constitution challenge by interfering with peoples’ right to assemble,” Supervisor Pat Herrity said in a statement.  The proposed zoning ordinance limits “group assembly” at residences to 49 people a day. Such gatherings “shall not occur more frequently than three times in any 40-day period.”  More