Are there any special acts of ibaadat which are Sunnat for the month of Rabiul Awwal?

Answer

There is absolutely nothing special ordered by the Deen for the month of Rabiul Awwal. It is a month as usual. One has to remain subservient to the Shariah and the Sunnah as usual as one is required to do every day of one's life. All customs associated with this month are haraam acts of bid'ah (innovation). A new bid'ah which has been innovated in emulation of the Qabar Pujaari (grave-worshipping) sect is the merrymaking, sing-song function which is fallaciously dubbed 'seerah jalsah'. It is purely a nafsaani jalsah which ulama-e-soo' have innovated.