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It happened about 2p today. Solar was producing and PW's were at 100%. Exactly the edge case where the freq was raised to kick off the solar inverters. Lights flickered super fast and I heard the UPS's beep and that was it. Everything worked as expected and UPS's were back on line power from the PW's. Before I could double check the freq with the Kill-A-Watt, the power came on. 2 minutes was the time the grid was down. Gateway switched back to solar not long after and that was that.
At least I didn't have to go fix the clocks over a 2 min power outage!