I agree with the previous posts. However, I'll go one step further. If you really want to recruit officials, have your local assoc set-up an off-season recruiting committee. Most associations have some energetic folks with a lot of spare time on their hands in the off-season. In our case, it's an older guy with all kinds of energy and contacts with the schools from his days as a teacher.
Our boys association did the usual stuff... newspaper ad, word-of-mouth and posters. We have 3 new recruits on the boys side.
Our girls association did the usual stuff, plus we created a 3-person off-season committee who met regularly and formally worked on recruiting. The girls association has 31 new recruits this year.
Z