Mending the Moon can be a starting point for many discussions.
Here are some ideas:
 
STEM
How the moon affects tides and gravity
What is the moon made of?
The moon's orbit and changing phases
The moon landing

Poetry and literature 
The Moon by Robert Louis Stevenson
Moon stories and legends from around the world (see Activity Guide)
Write your own moon story

Nature and environment
How can we help to mend the planet? Here are some great websites with useful resources:
National Geographic Kids
Greenwise
Teach Early Years
The Healthy
Word United

Social and emotional learning
Teamwork
Kindness
Cooperation
Imperfection
Perseverance
Problem solving