I've agreed to have 5 friends round with their 3 babies (plus mine) and 2 toddlers, all aged 6 months to 18 months. We wanted to start a group where we all do activities I'm turn, so for example, one week is music themed with instruments and singing, next week sensory play, etc. I agreed to host first but have no ideas as they've all told me what they're doing. Any suggestions?