More than 100,000 people from all walks of life will take part in a mass paradeat Beijing's Tian'anmen Square on the morning of Oct 1 — National Day — to celebrate the 70th anniversary of the founding of the People's Republic of China.
all walks of life 各行各业；社会各界；各界人士
take part in 参加；参与
① a public celebration of a special day or event, usually with bands in the streets and decorated vehicles 游行
② a series of things or people 一系列（人或事）
③ a formal occasion when soldiers march or stand in lines so that they can be examined by their officers or other important people 检阅；阅兵