Mishenichnas Adar Marbim Bisimcha - When Adar enters we experience increased happiness.
Most people understand this to mean that it is automatic. Adar is a time of increased happiness. The Heilige Klauzenberger reads differently "When Adar enters WE must increase happiness". It is a command! Go around and make people happy. That is the avodah of Adar. Go to a hospital, old age home, or just call a lonely person and increase his/her happiness. Haman's Lashon Hara was that we are "mefurad" - emotionally distant from one another. The way to beat him is to come together and make others feel good about themselves and consequently about you.
Love and Blessings:):)!!