Host a swap meet.

Swap meets are great. Day of Blessing is another name we have used. Host a swap and invite folks to participate.  You may want to limit the swap to specific needs like children's toys, clothes, and equipment or hold a full scale event. You can also choose to be very structured with participants getting tickets for bringing items in order to use them to "buy" items. This can be a small event with 5-10 moms or it can be an entire community, it's all what you make of it.