Maharaja Ranjit Singh, is known for beautification of the temple by gold. The Gurudwara was completed in roughly 1604
It is said that around roughly 750 kgs of gold is used for the plating.
Devotees never look at the month of the year and it is crowded for all months. But the best time to visit would be from November to start of March when it is winter in Amritsar.
Entry is free to all and no fees are charged
There is no as such dress code, but wearing appropriate clothing and respecting the culture is expected. It is mandatory to cover your head all the time in the premises.
There are total 4 gates/ entrances and people from any caste , creed or religion are allowed.
Any time of day is good to visit. But visiting at night is also recommended to view its glory. Avoid weekends and any Sikh or Hindu festivities. Morning rituals start at 2am to 2.3o am and at 4 am where tourist crowds are less and more devotees.
Golden Temple is open 24hrs daily.
There are no fixed times as it open entire day and so is the Langar. The menus are simple vegetarian food including rotis( bread), dal (lentils), rice pudding known as kheer. Strictly high standards are followed for food preparation. There are many special documentaries on the Langar kitchen on Discovery Channels, Nat Geo etc.
Yes, volunteering for it and serving in many ways is possible. No enrollment forms, go to the sevadars managing the langar and express your interest.