The meeting will take place at the Siam City Hotel at 1pm, party leader Anuthin Charnvirakul said on Friday.
He said invitations had been sent to all political parties, as well as the anti-government People's Democratic Reform Committee (PDRC) and the Election Commission (EC).
According to Bhumjaithai deputy secretary-general Supachai Jaisamut, Democrat and Pheu Thai spokesmen affirmed that their parties would send representatives to the meeting.
PDRC member Suriyasai Katasila has received an invitation and will forward it to the group's secretary-general Suthep Thaugsuban for consideration.
Mr Anuthin also dismissed rumours that Bhumjaitai wanted the upcoming poll to be deferred, saying that his party's position was to be neutral.
The Bhumjaithai Party will field 125 list MPs and is still deciding how many constituency MPs it will field, he said. The party aims to win at least 34 MP seats.
That would match the total the party won in the 2011 election. Bhumjaithai supported the Democrats when they were in power after party founder Newin Chidchob, who has since retired from politics, had a falling-out with former ally Thaksin Shinawatra. Bhumjaithai remained in opposition with the Democrats after the 2011 vote.
However, some Bhumjaithai MPs have joined Pheu Thai this month in preparation for the next campaign.