If your summons states SUMMONS FOR STANDBY JURY SERVICE at the top of your summons, then you must check to see if you are required to serve after 4:30 p.m. on the business day before your service date. If your service date is a Monday, you can check anytime throughout the weekend after 4:30 on the proceeding Friday. You may check your status by calling (312) 603-5950.
If your summons is NOT a Standby Summons, you MUST appear on the date and location specified on your summons.