What can be a consequence (positive / negative) of social gathering regular meet ups in relation to influencing on the job HR cultural change task?

As long as you keep it strictly professional ... I only see positive network development

Professional networking is a great tool in real life too and hence, that would be a plus for enhancing engagement within teams. However, networking at work outside the defined boundaries of acceptable professional behavior would be the minus!

positive when they use on work and connection

negative if them use and didn't did them work

I think consequences will be positive regular meet-ups causes sharing minds and ideas. Gaps can be discuss and acquire positive transformations.

Agree with answers of Ali Ahmad and Ahmed Mohamed