One of the best ways to find more Shot Clock and Timekeeper volunteers is to teach them how to do it. At the beginning of the season run a "training session" for parents during a practice. Have someone who is proficient with the shot clock and scoreclock teach everyone how, and then give them the chance to practice on their own during the practice. It's a good way to teach everyone and once they know how they tend to be more comfortable "volunteering" to do it.
Time Keepers: Reponsible for starting and stopping the time clock during the game, recording goals scored and posting penalties as indicated by the referees.