Pick a task you both have an interest in.
Perhaps choose a task that can be entered in one of the National
Grandparent's Day Contests
Plan a meeting and working schedule.
Make sure the materials you need to present your project are
available
and in working order.
LISTEN, LISTEN, LISTEN, and learn from age old wisdom.
Have fun.
Don't wait until the last minute to get started.
Pick a task you both have an interest in.