The Month of Nissan
Shavua Tov, Chodesh Tov-
We have now begun the month of Nissan. This is a very happy month and is referred to as the חודש הרחמים, the month of Divine mercy.
Almost the entire month has special events taking place. From the first to the twelfth of Nissan, each head of a tribe, brought special sacrifices commemorating the dedication of the Mishkan. The thirteenth of Nissan was אסרו חג, an additional day of celebration.
The fourteenth of Nissan was technically, חג הפסח, as that was the day that the קרבן פסח was prepared. The next seven days from the fifteenth to the twenty-second, was חג המצות, the Holiday of Matzot.
In the future, there will be seven days of celebration right after Pesach, rejoicing the coming of Mashiach.
We see that the entire month is special. We, therefore, do not say תחנון the whole month, and fasting and eulogies, are forbidden. It is a most auspicious time to pray for the גאולה, redemption.