The Beijing Municipal Archives will release around 30,000 files to commemorate the 75th anniversary of the founding of the People's Republic of China, which falls on Oct 1.

Among them are more than 3,000 files recording the capital's preparations from 1951 to 1999 for the celebrations of the National Day and International Workers' Day, falling annually on May 1, including reception plans, event arrangements, work briefings and summaries, and sketches of parade layouts.

Highlighted in the exhibition are design sketches and models of 32 parade floats that glided through Tian'anmen Square during major National Day celebrations.

The first batch of around 16,800 files were released in June to celebrate International Archives Day on June 9, while the rest will be made public before the National Day holiday, according to Liu Li, deputy director of the municipal archives.