Monday and Tuesday, May 4th & 5th, is Rosh Chodesh Iyar.
Iyar is a two day Rosh Chodesh, which begins Sunday Night
Please remember to add in all your Tefillos beginning Sunday night until Tuesday night in your Maariv davening, Yaale v’Yavo in your Amidah and when you bentch after eating.
Many have the custom to mark Rosh Chodesh with a festive meal and reduced work activity. The latter custom is prevalent among women.
Special portions are added to the daily prayers: Hallel (Psalms 113-118) is recited -- in its "partial" form -- following the Shacharit Amidah prayer, also the Yaaleh V’yavo prayer is added to the Amidah and to Grace After Meals; the additional Musaf prayer is said. Tachnun and similar prayers are omitted.