For much of the year, Buckingham Palace is used by The Queen and members of the Royal Family for official functions and events.
The
State Rooms of the Palace are open to visitors during the Annual Summer
Opening in August and September, when Her Majesty is in residence at
Balmoral Castle.
To get a idea of what it might feel like to
stand in a room at the Palace, explore a Virtual Room, which allows you
to have a 360 degree view of The Grand Staircase or The White Drawing
Room.
Thousands of visitors each year make their way up the Grand Staircase to the State Rooms when attending a Reception or Investiture.
Designed by
the architect John Nash for George IV, the staircase was augmented by
Queen Victoria when she added portraits of her immediate family.
The
Throne Room is used principally for the reception of formal addresses
on important occasions, such as those present to The Queen’s Jubilees in
1977 and 2002.
The Blue Drawing Room was originaly known as the
South Drawing Room. Today it.is used by guests who gather here before
large luncheon parties and grand State and diplomatic occasions.
The
White Drawing Room is used for receptions and audiences and has been
used as the backdrop for a number of formal photographic portraits of
members of the Royal Family.
Source: http://www.royal.gov.uk