These are not sponsored by the troop. Scouts and parents are responsible for registration and supervision. As with all merit badge programs, you should make sure to speak to the Scoutmaster to obtain a blue card at least one week before the class date.
August 26: Coin Collecting merit badge at the 2017 Golden State Coin Show. Registration Information: http://www.coinshows.com/arcadia_nasc.html
August 26: Merit Badge Mania 2017 - Sponsored by the Verdugo Hills Council BSA. Registration Information: https://vhcbsa.org/merit-badge-mania-2017/