Mobile?
Laptop?
Desktop?
Which model of the above are you using?...4,4s,5s,6,6+.... Or air, MBP,retina MBP... iMac Mac mini...
Even more important what version of 'ical' and what version of which ever iOS or OS X are you on.
it's now called Calendar by the way..
Or do you have a car you call iCal?