You could get creative in the kitchen and explore changes of state with Toffee Apples or Treacle toffee. (science-sparks.com)
This lesson includes a powerpoint on changes of state (I always purchase some dry ice to demonstrate sublimation in class), properties of solids liquids and gases as well as melting and boiling points. (tes.com)
Two of the things from my childhood I associate most with this time of year are toffee apples and treacle toffee, both of which are great for demonstrating changes of state. (thinlyspread.co.uk)