The meeting will be attended by Union Tourism Minister K J Alphons, who is also the party's Meghalaya election in-charge, Assam minister and North East Democratic Alliance convener Himanta Biswa Sarma, and others.
"Who doesn't want to be part of the growing and happy family? And there are more surprises in the days to come when more legislators will be joining us," Lyngdoh told IANS.
Hek is a former BJP-turned Congress legislator, who was a Health and Family Welfare minister in the Mukul Sangma cabinet before being sacked last year. He had contested and won on a BJP ticket in 1998, 2003 and 2008 polls and joined the Congress in July 2009. He contested the 2013 assembly elections on a Congress ticket and retained the Pynthorumkhrah seat.
Syngkon, who had been a parliamentary secretary, had withdrawn his support to the Sangma-led Congress government.
The latest political development in Meghalaya comes at a time when nine sitting legislators, which include six from the ruling Congress, have resigned from the state Assembly to contest the polls on the ticket of National People's Party (NPP), which is a part of the NDA.
The other five former Congress legislators -- Rowell Lyngdoh, Prestone Tynsong, Coming One Ymbon, Sniawbhalang Dhar and Ngaitlang Dhar -- along with former United Democratic Party legislator Remington Pyngrope and Independents Hopeful Bamon and Stephanson Mukhim, will formally join NPP on January 4 at a public meeting.