DPCC president J P Agarwal said such expenditure was reflective of the party's "culture".
"There is a disconnect between what BJP says and what it does. They talk about issues affecting the poor people but see the way they are splurging money for the rally," Agarwal said.
Aam Admi Party alleged money earned through "illegal means" is being spent for the rally.
"Money collected through loot of public funds is being used for the rally," AAP leader Arvind Kejriwal charged.
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Asked about the attack by Congress and BJP, senior BJP leader Vijender Gupta, however, rejected the allegations and said contribution by party workers have helped the party make the arrangements.
Asked about budget for the rally, Gupta, who is convenor for the rally, said "some things have been sponsored. Some of the arrangements have been made by the party's district units. We cannot give a proper figure," he said.