MG12 is the 12th Marcel Grossmann Meeting on General Relativity and Gravitation, for the first time held in Paris, France, hosted jointly by UNESCO, which has offered its headquarters for the plenary sessions and some of the parallel sessions, and by some of the most outstanding scientific institutions nearby (by metro) which have witnessed fundamental discoveries in physics and mathematics, including the Ecole Normale Superieure, the Observatoire de Paris, the Collège de France, and the Institut Henry Poincaré, all within walking distance of the Pantheon (home of the original Foucault pendulum) in the Latin Quarter.

Paris is a lovely destination city to visit all year round but the timing of the meeting could not be better. The July weather is typically warm and sunny, and the Tuesday of the meeting week is Bastille Day, a day of national celebration that is especially actively celebrated in the nation's capital, which sees Paris turn into a big party town with dancing in the streets, concerts, fireworks, and a frenzy of activities for those lucky enough to be present to enjoy them. Tuesday afternoon will be free of meeting activities so participants can take part in these events.

The conference banquet will be an elegant catered event held at the UNESCO headquarters on Wednesday evening. Additional tickets are available for accompanying persons.

For those who arrive in time, early on-site registration and already registered check-in will take place Sunday afternoon at the UNESCO headquarters (??), as well as each morning preceding the plenary sessions. The meeting will officially open with the first plenary session Monday morning, followed by five more morning plenary sessions, closing at the end of the Saturday plenary session. Four afternoons of 4 hour parallel  sessions will take place Monday, Wednesday, Thursday and Friday.