The Lunar Society was a discussion club, of a number of prominent industrialists and scientists, who met regularly in the latter half of the 18th century in Birmingham, England. The society's name came from their practice of scheduling their meetings at the time of the full moon (in that time of no street lighting, the extra light made the journey home easier).
They were a very influential group in British science and industry of the time - amongst those who attended meetings more or less regularly were:
More peripheral characters and correspondents included:
Sir Richard Arkwright, John Baskerville, Thomas Beddoes, Thomas Day, Richard Lovell Edgeworth, Benjamin Franklin, Thomas Jefferson, Anna Seward, William Small, John Smeaton, Thomas Wedgwood, John Wilkinson, Joseph Wright, James Wyatt, Samuel Wyatt.
A special purpose wiki has recently been constructed to continue the tradition of the Lunar Society: http://www.greencheese.org