I received a summons last year and I was going to be in Seattle for the dates they listed. Here in Ohio, I just called the number on my summons left a message and they called back and confirmed it and said they would put me down for a later date. That's been almost a year and I haven't heard anything!
I wouldn't ignore it though. I remember a woman who went on vacation without notifying the court and they put her in jail when she came back!
I'm sure that's pretty rare, but I would contact them for sure!