Whether a small function for 50 + people can be organized in the temple premises ?

They have a big hall. Call for appointment to discuss what kind of function you want to celebrate.

Can I get contact no of Sri Mukul Rastogi

We need to call and provide details, definitely can be done

There is a durga temple on rt 27 , they have big halls. 4240. Rt 27 , Princeton. Nj 08540

Bridgewater temple will accommodate

Yes

Depends on the kind of function you are asking for. If it's any divine gathering, they might agree.