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Have you thought of using group sms? If you create a group consisting of all your members, some phones allow you to sms them as if it is one person. That may be worth trying out
There is no expected group size. The aim of the group is to increase participation and engagement with a minority group in a conservative town. Members at the moment are from supportive organizations interested in diversity. Participation from the minority group is poor but then again the supportive organizations are not from the minority group. Anyways, my question is broad as I was keen to hear more about techniques that work rather than just focus on inclusivity and diversity.