The Spanish Constitution Day is a national public holiday that falls annually on the 6th of December; marking the referendum that transitioned Spain to become a democracy on the same day in 1978.

On the days leading to Constitution Day, children are usually educated on the history, politics, and constitution of Spain. The parliamentary buildings in Madrid are usually open for the populace for a few days, where students and the general public are invited to read the constitution in the Lower House.

On the day itself, the general population takes the day off, and most organizations, businesses, and stores are closed, except for some bakeries and grocery stores. Whereas public transports are usually running –except in rural areas, where it is provisory– though to a reduced timetable.

The celebrations of Constitution Day are rather quiet, where the majority of people prefer either spending the day with family, relatives, and friends; or in serenity. Official ceremonies could cause traffic jams in Madrid, however.

If the holiday falls on a Sunday, the authorities usually push it to a different day. In case of falling on a working day two days prior to, or subsequent to, a weekend holiday, many businesses and organizations usually take the in-between day off, as well.