Greeks are expected to gather outside parliament to light candles in memory of those who lost their lives, on Monday.
The silent gathering is being organized via social media by former basketball player Yiannis Gagaloudis.
He calls on people to gather with candles at Syntagma Square at 9 p.m. to “illuminate the sky and the souls of our fellow human beings who have lost their lives.”
At least 91 people were killed in the coastal resort of Mati, which is 30 kilometres (17 miles) east of Athens.
A total of 25 people are still missing and 28 bodies have yet to be identified, the fire brigade said on Sunday.