|Status:||Proposed (under way)|
|Definition:||A place designed to be used for events such as circuses, fairs and other shows|
It's very common in Brazil to have areas where circus and other festivals are temporally installed. For example, in the city where I live https://www.openstreetmap.org/browse/relation/3071243 It's tagged as a recreational ground, but in fact it isn't (nor is a theme park). Since there isn't a tag that properly fits the purpose of this kind of area I am proposing this new value for leisure (formerly landuse):
A place designed to be used for events such as circuses, fairs and other shows.
What makes it different from amenity=community_centre:
Community centres (http://en.wikipedia.org/wiki/Community_centre) are generally public buildings/institutions managed by a community in which are ran specific activities inside the facility that may or may not be opened for everybody (maybe only for its members), while leisure=events, as its tag says, is a land (open) used specifically for temporary, usually open-air events, such as the example told in the beggining of this proposal. Community centres, as amenities, may be found in the area designed for events.
Here are a few satellite imagery links showing where some event areas are found:
http://binged.it/19kxgU2 Circus area in Presidente Prudente - SP, Brazil, already quoted in the beggining of the proposal. You can see some tents in the image.
http://binged.it/18ehwmI Recinto de Festa do Carmo, in Araraquara - SP, Brazil, where circus shows are made as well.
http://binged.it/19kzoLw The inner land of this roundabout in Ribeirão Preto - SP, Brazil, is used for events in general.
http://binged.it/1h4EgcT Parque do Peão in Barretos - SP, Brazil, area used for rodeo events.
https://binged.it/2tkG4Nn Heiligengeistfeld in Hamburg - Germany, area used for funfairs, circus shows, music festivals, public viewing during soccer world-cup, ... See https://commons.wikimedia.org/wiki/Category:Heiligengeistfeld for examples.
Please, comment in the discussions section.