[NCASAUmp]

Well, I'd say it's definitely the town's issue. However, many towns with local leagues have a little form for the field supervisors to fill out at the end of the night. One typical question is: was the field fit to play? To protect yourself, I would inform the supervisor that you'd like to add a few things to the form, and I would specifically mention the pegs and the open 3B issue. Mention that it is a liability that could result in serious injury. If someone gets injured later on, I'd say that in a courtroom, you would be covered, as you had informed them in writing that this is an issue. Their failure to remedy the situation before the next night would put them in the wrong.

However, what to do about it on the first night you encounter this? That's a darned good question. I'd go straight to the field supervisor for sure, and I'd raise hell that the exposed 3B hole on the field is unsafe. Those metal plugs, while lame, I suppose are good enough. Caution both teams during the pre-game meeting, if you have one.

Would I suspend play after the first pitch? That's a tough one. I'm fortunate enough to have field supervisors who have access to all the field equipment, including the Pro Choice field-drying stuff, base plugs, safety bags for 1B, etc. Any issues like you mentioned would be quickly remedied by me saying, "hey, guys... can you take care of this before gametime? Thanks!"