For these facts, you can always contact the Guinness book of records. There are regularly new records in, or old ones improved.
Some records are included in the topics here, some others are collected below.

The biggest Cha Cha Cha
On July 17, 2011 3,379 people danced in Punggol Singapore Cha Cha Cha. This was organized by the Edgefield Primary School. 43 participants were disqualified because they did not dance the choreography well.

DansrecordsThe biggest Cha Cha Cha in multiple locations
On Nov. 3 2007 47,795 people were dancing at 309 locations in Germany and Austria simultaneously the Cha Cha Cha. This was organized by the Allgemeiner Deutscher Tanzlehrerverband (ADTV).

Most dance partners in 24 hours
On 23 and 24 November 2007, Michael Hull danced in Osnabruck in Germany for 24 hours with 1,068 dance partners.

The most danced styles simultaneously on a number.
On October 5, 2008 in Leicester in the UK were 48 styles danced simultaneously for 2 minutes on the song "Dancing in the Streets" by 592 people.

The longest dance marathon by a couple
On 15 and 16 November 2008 danced Francisco Petatán- Garcia and Joana Salinas - Aviles in Acapulco, Mexico 35 hours straight together.

Most taps in a minute were danced by Anthony Morigerato (USA) on Eleanor School of Dance in Albany, New York, USA, on June 23, 2011. It took him 1,163!

Gisel Weser (Germany) (February 1, 1921) is the oldest dance teacher. She worked at Triebel - Hölzer (founded in 1883), Lutherstadt Eisleben, Saxony- Anhalt, Germany, since 1949. She was head of the school in 1968 and continues to teach there.

The oldest competition ballroom dancer Frederick Salter (UK, February 13, 1911). He passed with honors for his IDTA Gold Bar Level 3 exams in Latin and Ballroom at the age of 100 years and 245 days, in Eltham, London, on October 15, 2011.

Most dance spins in one minute were danced by Femia Marina (Italy) and Alexander Caicedo Sastoque (Colombia) on the set of Lo Toon dei Record in Rome, Italy, on March 27, 2010: run 195 times!

The biggest Sirtaki dance was on September 3, 2008 at Rhodes in Greece made ​​by Google employees with 1,672 participants from all over the world.

The biggest Rueda de Casino consisted of 706 participants who danced minimum 5 minutes. It was done by the Yamambo Dance School in Campo Sportivo, Assago, Milan, Italy, on July 3, 2010.

The largest cheerleading dance included 297 participants from the University Cheerleaders Association (USA) at the University of Memphis, Tennessee, USA, on November 7, 2009.
The participants danced for 5 minutes and 43 seconds.

The largest Macarena dance with 2,219 participants took part in Eggbuckland Community College (UK) in Plymouth, UK, on July 7, 2011.