If you have pre-schoolers then half terms can be a bit difficult. Lots of toddler groups or baby classes take a break during school holidays, and soft play centres or museums are often much busier as the older kids are off. If you are looking for some pre-school events during half term then you should check out Alnwick Playhouse. Their childrens program, Creative Cocoon is brilliant. There are lots of quirky shows, and a regular playgroup which looks so sweet. I wish that I lived closer as I would visit much more often.