Please avoid loud talks, jokes, arguments, anger etc and spend these days in silence and meditation maximum possibly. Please avoid any gatherings, celebrations, parties, etc even if held by non- christians and make them realize how much reverence we give for these days by your exemplary activities ...!
All those who missed to make a confession or to pray the 'way of the Cross' can make use of these days. If on these days, you are forced to work, proclaim your love for your Lord who saved you with HIS passion by observing quiet and exposing a mourning face.
Even if you do not want to love Lord Jesus, please do not hate HIM... and increase HIS passions.