Just thought I'd share this fab website I discovered whilst exploring the things S and I can do together:
Cleverly (and usefully, for me), it has a search facility that allows you to find things happening on specific days. Also you can search by age group, activity type and area. It covers most of South Manchester as well as Manchester City Centre, I've already found a few things that might prompt me to revisit my old haunts Didsbury and Chorlton. Have a look, there are some great ideas on there.