All they need to do is open the infield up for a few hours using a Harold (sp) or tiller. If it is sunny and windy it can dry out very fast and then drag smooth again.
I had to do this every time it rained back when my father owned a softball complex. We had the least amount of rain-outs (only time we got rained out if it didn't stop raining, but give me 4 hours of no rain before game time and I will make it playable) compared to all other leagues back then. Plus this method keeps the ground soft unlike adding a product like diamond dry which will create a concrete hard playing surface (we would never use such a product).
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