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It's Dec. 12, 2012 or 12/12/12, the last time we will experience a sequential day, month, and year combination in our lifetimes. The next time will be 10/10/10 in 2110.

On this unique date, special events are planned as a World Day of Connectedness, including:

Ceremonies marking a new time of life based on loves at Lake Titicaca in Peru.

Networking events with the theme of "Entrepreneurship and Technology" in Lisbon, Portugal.

A day of "Vigil" is planned in Vancouver.

An "All you need is Love" concert will be held today in Amsterdam.

In San Francisco, the big event marking 12/12/12 will be a majestic gathering of yogis, poets and mystics at Union Square.

But the big event is the Concert for Sandy Relief to benefit the Robin Hood Relief Fund being presented in New York by Chase.

Some of the largest names in the music industry will come together through several live streams and social media integrations that will allow the charity concert to reach an unprecedented nearly 2 billion homes worldwide as possibly the most widely distributed music event in history.

Bon Jovi, Eric Clapton, Dave Grohl, Billy Joel, Alicia Keys, Chris Martin, The Rolling Stones, Bruce Springsteen & The E Street Band, Roger Waters, Kanye West, Eddie Vedder, The Who and Paul McCartney will perform at the one-night concert at 7:30 p.m. Eastern time at New York City's Madison Square Garden, benefitting victims of Hurricane Sandy through the Robin Hood Relief Fund.

Facebook and other social media will help spread the 12/12/12 event far beyond New York City.

People will have access to the concert through 34 TV broadcasts across the globe, plus being streamed on nearly 30 websites, including YouTube, MTV.com, Hulu and Myspace. Several movie theaters in New York, New Jersey and Connecticut will screen the concert as well.

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