Rosh Hashana: What is Rosh HaShana really all about? Is it a happy day or a sad day ? Is it a scary day or a calm day ? Is it judgement say or a Yomtov ?

Rosh Hashana: What is Rosh HaShana really all about? Is it a happy day or a sad day ? Is it a scary day or a calm day ? Is it judgement say or a Yomtov ? — מובחר ועד הנגינה