It has been reported by Imam Khomeini’s disciple that Imam used to move Karbala some days before Ashura.
Then he used to move to Karbala and stayed there until 13th of Muharram.
Imam in Karbala used to regularly visit the holy shrine twice a day before despite the excessive crowds.
He would never miss the pilgrimage due to too much number of pilgrims or his physical condition. It happened sometimes that Imam Khomeini was stuck in the crowd that his companions felt fear for his life so that he would not perish.
(A memoirs about Imam and his life)