sleepout

Short definition from Wiktionary

Noun

1. 1
   A veranda or other outbuilding used as a sleeping area.
2. 2
   an organised group of people sleeping in the open, often as a form of protest or to raise public awareness of an issue such as homelessness.
3. 3
   a holiday in Africa where travellers sleep away from their home, generally in an open air safari lodge, private home or guest house.