ames-
It’s been a while in my case, and I don’t know if your summons was for federal or state(?) court, but we had a case of forgetting a summons date several years back. To the best of my recollection, when we called the contact number we were told that an in-person appearance was required, but we didn’t “get into trouble”.
This was several years ago, and I don’t remember if this was federal court or not, but based on our experience I’d recommend phoning the contact number and hopefully they’d be understanding.
I wish I could give more definitive info – this is based on the experiences my wife and I had.
Hatzlocha raba.