Who collected whether the weather in Hebei and Beijing is sunny, cloudy or rainy every National Day over the years?

This kind of data is available in meteorological stations (meteorological bureaus). Individuals don't have it.

Before holding a large-scale outdoor activity, the meteorological department is required to provide the weather conditions on the day of the activity and the days before and after, mainly the precipitation probability and temperature.

If you need this information, you can bring a letter of introduction from the company and ask the local meteorological department.