The term "procession" used in this Law means an activity in which people line up for a march along a public road or across a public place in the open air to express their common aspirations.

本法所称游行，是指在公共道路、露天公共场所列队行进、表达共同意愿的活动。

youdao

It was a treat to see the place, which is not open to the public.

FORBES: Inside the Louis Vuitton Special-Order Workshop

Now part of the White Sands Missile Range, Trinity remains a secretive place: It is open to the public just two days of the year, on the first Saturday of October and April.

NPR: Revisiting the Birth of the Bomb

In 1979 a brave attempt to bring these issues out into the open took place next door to the China Art Gallery in a small public park.

CNN: ASIANOW - TIME Asia | Visions of China: China Art Gallery