Any special occasion is not required for taking gift. Gift can even be taken without any special occation. Further, there is no specific documentation with regards to the gift. The procedure is just handing over the gift (or the cheque in the current case.) However, in order to avoid future controversies, the parties are advised to make a gift deed. However, it is not compulsary.
However, In case of immovable properties, the property of Value Rs. 100/- or above can be transfered only through a gift deed. This is an exception to the statement given in the earlier paragraph.