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Setting meeting date/times can be accomplished a variety of ways.
As you're recruiting volunteers for your respective committee, you can tell them the already set meeting schedule, make sure it works for them, and give them a copy to write in their planners. The only issue is if you have a perfect volunteer for the committee and they can't make the pre-set meetings, they may not be able to volunteer.
A better alternative to setting the timelines for meetings would be to recruit your volunteers and then at the committee launch meeting, set a meeting schedule everyone can agree upon. What usually works best is to determine when members are available and then set a consistent time to meet. An example would be the third Thursday of every month at 6:00 p.m. You may have to make adjustments for major holidays or vacation times.