Pakistan High Commission sources said it has been an usual practice to invite the Kashmiri separatist leaders on such occasions.
Earlier, the High Commission had scheduled the dinner for July 4 but later it was postponed to July 21.
While Pakistani officials maintain that it was postponed due to some deaths in Karachi but the move was seen here by many as an attempt to avoid any bitterness ahead of talks between Prime Ministers Narendra Modi and Nawaz Sharif in Russian city of Ufa.
Modi and Sharif held a bilateral meeting three days back on the sidelines of the Shanghai Cooperation Organisation (SCO) summit in Russian city of Ufa in which they decided to revive the stalled dialogue process and quicken the Mumbai attack case trial.
However, in a turnaround, Pakistan today asked for "more evidence and information" from India on the Mumbai attack case and asserted that talks cannot take place without Kashmir being on the agenda.