The month of Shawwal is the tenth month of the Hijri (lunar) calendar. During the pre-Islamic era the month of Shawwal was regarded as a month of ill-omen. Some people avoided marriage during the month of Shawwal believing that marriages during this month would not be blessed.
The reality is that all months are blessed – Nabi r prayed for every month to be a month of goodness and guidance. Among the merits of this month is that the blessed day of Eidul Fitr is celebrated on the 1st of Shawwal. Shawwal also represents the onset of the season of Hajj.
Hazrat Ayesha (RA) said: “Rasulullah (Sallallahu Alaihi Wasallam) married me in Shawwal and consummated the marriage with me in Shawwal, and which of his wives was more beloved to him than me?” - Ayesha (RA) preferred that the women (of her family) marry in the month of Shawwal. (Sahih Muslim)
It is mentioned in Al-Bidayah wan Nihayah: “The fact that Nabi (Sallallahu Alaihi Wasallam) married and consummated his marriage with Ayesha (RA) during Shawwal was a refutation of the notion that it was disliked to consummate a marriage between the two Eids, as it would result in the separation of the spouses.” (Al-Bidayah wan Nihayah)