Noun for an experience you went through with others

Question

I asked a similar question before, about what to call a group of people that went through the same class, semester of a program, club, spent a week cruising with each other, etc.

But what I want to know is, a word that captures that all of you went through the same ____________.

I'm building an app and I need this as a general term to denote the organized experience you went through together. It's part of an organized program, probably a section of it, recurring. It's going to be used quite often throughout the app once I select one. So I'm soliciting ideas.

Just to give you some terms we already use:

• Community - refers to any sort of community, e.g. students and alumni of a university, or neighbors in a building, or people who are taking / have taken a cruise, etc.
• Group - a group of people that forms on demand to do some activity, e.g. go get some sushi, watch a movie, take a trip, etc. You can join a group or start a group.

So this term would join the others, to denote a "subcommunity" of people that went through the same experience, organized by some organization.

To give you more context, this is our product: http://qbix.com/communities

Answer 1

Two that spring to mind are a collective experience and a mutual experience.

All of us went through the same collective/mutual experience.

Answer 2

Well there are nouns for different forms of shared experiences such as dalliance and collaboration.

Answer 3

All of us went through the same ____________.

All of us went through the same shared experience.

That means we have a shared bond.

Answer 4

It's part of an organized program, probably a section of it, recurring.

As you specify that each experience is part of a program perhaps episode will best describe them.