Where and when was the Second Continental Congress held and what did it do?

Continental Congress refers to a convention of delegates
from the American Colonies. This coming together of colonies was the expression of their
desire for unity which had spread through the colonies, in view of threat to their
interests by the acts of the British Parliament aimed against the colony of
Massachusetts, especially the Boston Port Bill.

The First
Continental Congress, held on September 5, 1774, was attended by 56 delegates
representing 12 colonies.

Second Continental Congress.
officially called "Congress of the Confederation", met in Philadelphia on May 10, 1775. 
This Congress took on the duties of a government, uniting the colonies for the war
effort. The Congress issued a declaration on July 8, 1775 outlining the need to take up
arms and two days later made a final appeal to Britain to set matters right to avoid
war.

With the outbreak of war, on July 4, 1776, adopted the
Declaration of Independence.  Subsequently it addressed the task of preparing for
permanent union of states. This resulted in preparation of the Articles of
Confederation.

The second Congress continued to work until
March 1, 1781, till a Congress authorized by the Articles of Confederation took
over.