Wikki does it best: http://en.wikipedia.org/wiki/Pop-up_restaurant
Themed dinners from all parts of the world in small numbers and cozy atmospheres. Crockery may not match but the food will be excellent. Chairs may differ in size but you'll have good company. Prices will make dinning out affordable especially since you will bring your own drinks (apart from water). The venue will often be in someone's front room, somewhere in the city. It may also be in a garage somewhere. Exact Location will only be given once you have signed up and paid for the dinner in advance. Dates you will know. The menu might differ only slightly (whatever is freshest on the day's market shop) and company? Well that's up to you. Bring a group, bring a friend, come alone, share a table with strangers who become friends.