Maha Shivratri is dedicated to the worship of Lord Shiva.
Lord Shiva is known as the God of the gods.
But he is also very dear to the non-gods such as ghosts (bhoota) and asuras (so called demons or villains of society), humans, sub-humans, gandharva and rakshasas and other entities and spirits and night dwellers.
This night –SHIVARATRI-- they ALL have a chance to worship Him together.
(Shiva is Name of Lord. Ratri means night hence Night of Shiva.)
Lord Shiva is very kind and very dear to all these sprits and gods and humans.
Infact he is also know as Bhootnath --means the Lord of Spirits (Bhootas)
He also known as Anaathnath means Lord of Orphans. Anaath means orphan (one who does not have anyone).
As long as Shiva is there, no one is an orphan, as he is their naath (Lord)
So His blessing is upon all of society and this one special night is a chance for ALL to come together and leave their differences and join in the worship of GOD.
This night is yet another opportunities for all to leave their bad ways and get a chance to change for the good.
This is my take on the whole event of Shivaratri.