Reply To: WHY DO LITVOCKS ALWAYS SAY TACHNUN??

I’ve always been led to understand that the reason for not saying tachanun on certain days is because the speciality of the day achieves what tachanun would normally achieve (same idea of why we don’t blow shofar when Rosh Hashana is on shabbos because shabbos achieves what shofar would have). So by chassidim there are lots of special days that are holy enough that tachanun isn’t needed.