With 3G /4g the only thing that really calls a game off is ice. A frozen pitch is lethal, because any water in the pitch freezes the fibres together and stops them moving apart. This makes the pitch a solid lump that's impossible to keep your footing on.
Do a pitch inspection in mounded studs or preferably Astros. Start out slow and cautious and just walk across the surface to see how easy it is. If that's ok then move a bit more quickly but don't go too fast too soon. Pay special attention to areas that don't get much sun.
If the pitch is solid then a game would be risky. If you can't keep your footing while walking then players won't in a game and hitting your head on it can really hurt.
Make the decision on your own. Then maybe take the captains / managers to show them danger areas if the pitch is bad.
If you play and players start slipping don't be afraid to call it off. It's easy to tear something or hit your head. Player safety is the primary concern, and even if they haven't played in weeks they won't thank you if there is a serious injury.