Which preposition to use with bairam

in Occurrences 1%

The keys of Buda were sent to the conqueror, who celebrated the Feast of Bairam in the castle of the Hungarian kings.

of Occurrences 1%

The Bairam of the Turks answers to our Easter, as their Ramadan does to our Lent.

Which preposition to use with  bairam