Girl Scouts of Eastern Massachusetts will hold its annual membership drive on Monday, Sept. 21 from 7:30 to 9:30 a.m. and 7 to 8 p.m. at the Weston Scout House, 86 School St.  Another membership drive will take place on Friday, Oct. 16 from 6 to 7:30 p.m. at Wayland Town Beach.   Local girls and their families will have the opportunity to sign up for Girl Scouts, participate in a fun activity, and meet new friends. Girl Scout troops are formed on the availability of adult volunteer leadership. Become a leader today!   Girl Scouts is the ultimate leadership experience available to all girls ages 5 to 17. Girl Scouts of Eastern Massachusetts offers innovative, creative and exciting programs for girls of every level and interest.  For more information or to sign up visit their website or call 1-888-9-GIRL-SCOUT.