Hello! Here are a few places I know of:

http://www.meetup.com/CyberCare/events/228673927/ (it's recurring; have been here before)

I know you said weekends only, but here is one with longer period... you could def call and try to ask if they would accept weekend volunteers: http://www.sols247.org/

You could contact this group, they might be able to point you to the right direction: https://www.facebook.com/carefugees/timeline

[double post]

This post has been edited by sitoze: Feb 11 2016, 10:56 PM