lock-in

noun ! Definition from Wiktionary (CC BY-SA). More about lock-in at Wordnik → Where our words come from →

1. A sleepover party, usually held in a public place such as a church or school, in which the participants are not allowed to leave until the next morning.

   The youth group will have their annual lock-in this weekend.

2. An illegal but widely-tolerated invitation-only gathering in a pub, after the end of licensing hours, to allow regular customers the opportunity to enjoy further drinking time.
3. A situation in which a business has adopted a certain standard or product from a specific manufacturer and integrated it into their process, thus making it very costly to change to a different standard or supplier.

   vendor lock-in