According to BBC News:
More than 200 suppliers to the Royal Family have gathered at Buckingham Palace for a festival…
Members of the public are able to attend…, and 48,000 have paid £30 for a day ticket or £90 to attend an evening gala.
The firms involved are all royal warrant holders, so-called because the title allows them to display a royal coat of arms on their goods. …companies which have provided goods or services to the households of the Queen, Prince Philip the Duke of Edinburgh or Charles the Prince of Wales.
The Fanfare Trumpeters from the Household Division opened the concert…