Casual parties between colleagues, with or without their wifes / husbands are always a method of eliminate the stress accumulated in a week of work in the office. Communication in an informal environment helps people get rid of their negative emotions and help them know each other better. Also organizing parties for different occassions make people feel good in their company and improve the climate in the company.
Check MAXIM EVENTS and you will find some ideas of escaping for a while from every day problems in an efficient way.