They can be outside gatherings, like parties or group activities, or something simpler like group lunches at which people are encouraged to let their hair down and talk casually to one another. (inc.com)
Summer associates attend weekly practice group lunches where substantive topics are discussed and they participate in other professional development and technical training. (chambers-associate.com)
After that they can attend «periodic training» on specific deals or topics, including practice group lunches. (chambers-associate.com)