Former Chief Minister Oommen Chandy, Opposition leader in the assembly Ramesh Chennithala and former KPCC President V M Sudheeran were among those present at the function.
Hassan said he would take all efforts to stregthen and carry along all factions of the party together.
V M Sudheeran had resigned on March 10, citing health grounds after completing three years in the post.
67-year-old Sudheeran was injured after a fall in Kozhikode while attending a party function.
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