breakout

noun
1
an escape from prison, usually by a group of prisoners
فرار جمعی از زندان
adjective
1
suddenly extremely popular and successful; establishing somebody’s reputation
شهرت فوری, اشتهار ناگهانی, موفقیت‌آمیز ناگهانی
2
taking place separately from the main meeting with a smaller number of people
جلسه جانبی, نشست فرعی, جلسه فرعی, گردهمایی جانبی
a breakout session before the plenary
a breakout group on ethical issues
Here are some notes from the breakout session I attended.