Most organizations recognize the importance of successfully onboarding new employees. And they should, you have worked hard to hire the right people and it is important that you welcome, train, and set them up for success in every possible way from day one.
Several companies offer their employees something labeled as "team building activities", just look at almost any job advertisement or any company's social media feeds. These activities can vary from meals to happy hours to sports activities where the team spends time together outside of the workplace. After the event, the company posts pictures on their social media accounts to show others how much fun their employees have together, in hopes of attracting potential new talent.