Ruby: merge three array of hashes in different way

I'm new to Ruby and trying to build a meeting app. I have three arrays containing hashes :

• one containing my scheduled meetings with dates and therefore an empty array of people
• one containing the people invited per meeting
• and a last one containing the people who refused

This materializes as:

meetings = [
 {:id=>"1", :peoples=>[]}
 {:id=>"2", :peoples=>[]}
 {:id=>"3", :peoples=>[]}
]

invited_peoples = [
 {:id=>"1", :peoples=>['Tom', 'Henry', 'Georges', 'Nicolas']}
 {:id=>"2", :peoples=>['Arthur', 'Carl']}
]

absent_peoples = [
 {:id=>"1", :peoples=>['Henry', 'Georges']}
]

And I would like to have : meetings + invited_peoples - absent_peoples like

meetings_with_participants = [
 {:id=>"1", :peoples=>['Tom', 'Nicolas']}
 {:id=>"2", :peoples=>['Arthur', 'Carl']}
 {:id=>"3", :peoples=>[]}
]

I'm looking for a readable solution but I don't find anyone...

Sorry for my english and thank you in advance, Nicolas