I would suggest that you decorate the area with streamers and any posters. lombards has a football kit that has lots of bits and pieces to help decorate the areas and then you can keep the kit as a resource for years to come. you could also have a guessing comp. on who will win the brownlow medal or which team kicks the first goal, afternoon tea could be party pies and sausage rolls, dvds of past grand finals may help to set the scene (these maybe available from a library)
I have been a member of Golden Carers for several years and still find it as amazingly beneficial as the day I became a member. There are so many ideas and the support is wonderful, my job is made much easier with the help of Golden Carers.