Relevant Documentation: 

• VIDEO: How to Create a Custom Expectations (Great Expectations Hackathon)
• Contributing to Great Expectations
• Creating Custom Expectations
• How to contribute a new Expectation to Great Expectations
• The Expectations Gallery
• Webinars, Office Hours, and Virtual Events Calendar
• Semantic Types (Typed Entities) Explained

Connect with the Community:

• Great Expectations Slack Community
• Github Discussions