Celebrating with your team!

How do you celebrate with your CS team? Why?

• Do you have examples where you & the team have felt the power of celebration?
• Who are leaders that you admire for their powers of celebration? 
• Is there a moment in your work history – when you were not the leader – in which celebration made a significant impact on you?
• What happens when celebration is missing?

I'm looking to learn out loud about how others approach this topic. Whatever I do is intuitive, I have no process or guiding framework here.
I think I have a lot to learn. Anyone else?