Holi is an ancient celebration, unheard of to anybody in the West, as basic as our Christmas or Easter to people in India.
It is a tribute to one devotee's faith in the Master, and how that faith was enough to transcend death itself:
In legendary times the child Prahlad was a great devotee of the Lord. His evil sister Holica was jealous of his devotion and wanted to kill him. Holica could not be harmed by fire. So she took Prahlad and sat in a huge fire with him in her lap. But the Lord protects His servants. Prahlad was untouched, while Holica was burnt to a cinder.
Holi festival originated when Prahlad's friends celebrated his devotion by showering each other with coloured paint. -- This celebration became a tradition.
In 1979 Holi was celebrated by Guru Maharaj Ji and His devotees in Malaga/Spain and in Miami Florida.
Prem Rawat's "Knowledge" has three parts: regularly listening to his speeches, doing voluntary work for organisations serving him or donating money and daily meditation correctly practicing the four techniques he recommends. The techniques are so simple it's hard to see how they could be practiced incorrectly. First technique ("Divine Light") involves sticking your thumb and middle finger on your eyeballs (NB: with eyes closed) and your index finger between your eyebrows. Second technique: ("Heavenly Music") poking your thumbs into your ears and listening. Third technique: ("Holy Name") thinking about your breathing (NB: continue to breathe). Fourth technique: ("Nectar") curling your tongue backwards and tasting. Rawat's father taught slightly different techniques but either way it's difficult to see how these could produce the benefits claimed for them especially as Rawat claims His Knowledge is the only method of attaining real happiness and love in this life.