At our Summer Library Program workshop, one of the groups that librarians felt they had a hard time reaching is tweens (3rd-7th graders or so). I found a few good resources for people who are feeling like this is a gap for them:
Five Lessons in Tween Programming (from the ALSC Blog)
What Do Tweens Want (2015 SLJ Article)
Also: remember the amazing kits that both WVLS and IFLS have collected that are available to you, ranging from low tech (woodworking, jewelry-making, needle-felting, calligraphy, knitting) to higher tech (Makey Makey, Sphero, Little Bits). Many of these kits are perfect for this age group–it’s a golden age of MAKING.