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Host office potlucks. Start a sports league. Consider hosting a charity event.
Buying your employees a meal (like a pizza party) from time to time can help boost morale. But hosting a potluck might be even more effective at fostering a sense of teamwork and cooperation. Each employee will participate and work together to feed the staff with their own specialty, which also works as a metaphor for inter-office cooperation.  Announce the potluck a week or two in advance so that your employees can buy and prepare whatever foods they'll need. Ask your employees where their culinary strengths lie, and encourage them to create their own healthy, delicious contributions. Team work is a vital part of office productivity. It's also a natural part of team sports, which explains why so many offices host after work sports leagues. Starting a softball or bowling league can give your employees a chance to work together as a team while also relaxing and enjoying some down time together.  Talk to other offices in your area and see if they'd be interested in joining a friendly recreational sports league. If other offices aren't interested, consider starting an intramural league that only involves your employees. Contact local venues (like ball parks and bowling alleys) to find out how to start a league, and ask about discounts available for larger teams. Another great way to have your employees bond while working towards a shared goal is a charity event. You can organize your own event, or sign up your employees to join in with an existing event.  If you're starting your own event, seek feedback from your team. Talk to your employees, and ask them to vote on an event to participate in, as well as a charity to benefit from that event. Have employees who are interested in participating raise money or collect donations. Don't make donations mandatory, but remind your employees how important it is to help out the charity they choose. You can join a walkathon, for example, or simply offer your employees the opportunity to volunteer with an existing charity.