Onboarding is the process of introducing, inviting, and exposing you to something new - culture.
"Hey, it's nice to meet you, I want to invite you to find out more about how people like us do the work we do here."
"Hey, we're so glad you chose to do business with us. I want you to know how people like you order your food at places like this."
"I am so glad you chose to spend time with us tonight. During this time, you get to listen to stories, enjoy music, and share the experience with the people next to you - that's what people like us do at shows like this."
To understand culture is to understand how a group of people do and value things. For that process to happen, the new person must be exciting and committed to learning more - being curious. For that kind of curiosity to be present, there must be a guide.
If you're that guide, you have a generous responsibility.