NEW YORK — Seven networks, including NBC and TNT, will simulcast “The 1998 NBA TeamUp Celebration,” a 60-minute special.Slated for noon Feb. 7 Eastern time, the special will feature many of the National Basketball Assn. players who will be participating in the annual All-Star Game the next day from New York’s Madison Square Garden. Hosts of the special will be Ahmad Rashad and Willow Bay, who co-host the weekly “NBA Inside Stuff” half-hour series on NBC. The “NBA TeamUp” program encourages young volunteers to get involved in their local communities. The other networks that will simulcast the special are Nickelodeon, BET (Black Entertainment Television), Telemundo, the Madison Square Garden network and Canada’s YTV. Telemundo will telecast the special in Spanish.