Speaker of the 14th Assembly will also be elected during the session which will be first since the elections were held in December last year.
According to Rupani, MLAs delayed taking oath due to what they consider an "inauspicious" period of Makar Sankranti, which falls on January 14.
"MLAs felt that oath taking should be held only after the inauspicious Makar Sankranti period comes to an end. Thus, we have planned to call a two-day session soon after January 20," Rupani told reporters.
He said the exact schedule of the session would be announced after department of Parliamentary Affairs finalises the dates.
He said the special session might be convened at some another venue due to the ongoing renovation of the Assembly Complex in Gandhinagar.
In the 182-member House, the BJP, which won the sixth straight term in the closely-contested polls, holds 99 seats, followed by the Congress (77).
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