IPad 2/iPhone 4s synced from iMac iCal with no alerts, creating alerts 15 hours before each event

Question

My wife set up all her work meetings in iCal on her work calendar. Each event has no alert assigned. Right clicking on the work calendar and choosing Get Info, the drop down window shows an option to Ignore Alerts and it is checked.  In iCal Preferences under the Alerts tab, all 3 alerts are set to none.
On the iPad 2 and the iPhone 4s, under Settings - Mail, Contacts, Calendars - Default Alert Times are set to None while New Invitation Alerts and Shared Calendar Alerts are turned off.
Choose Calendar on the home page to bring up the calendar. then click any of the work events and it shows an alert for 15 hours before the event, and they do go off 15 hours before the events and quite annoying they are. The only way to get rid of the alert, is to go to each individual event, select Edit, select Alert, select None then Done, then Done again and then Save For Future Events since most of the events are repetitive.
Why does syncing the iPad & iPhone add this alert and is there not anyway to not have that happen?  It makes for a very time consuming process to go thru each event on each device to remove this alert.
Some other posts have had a similiar issue with no working fixes. Guess Apple is too busy fixing Maps.   ;-)

Answer 1

My wife set up all her work meetings in iCal on her work calendar. Each event has no alert assigned. Right clicking on the work calendar and choosing Get Info, the drop down window shows an option to Ignore Alerts and it is checked.  In iCal Preferences under the Alerts tab, all 3 alerts are set to none.
On the iPad 2 and the iPhone 4s, under Settings - Mail, Contacts, Calendars - Default Alert Times are set to None while New Invitation Alerts and Shared Calendar Alerts are turned off.
Choose Calendar on the home page to bring up the calendar. then click any of the work events and it shows an alert for 15 hours before the event, and they do go off 15 hours before the events and quite annoying they are. The only way to get rid of the alert, is to go to each individual event, select Edit, select Alert, select None then Done, then Done again and then Save For Future Events since most of the events are repetitive.
Why does syncing the iPad & iPhone add this alert and is there not anyway to not have that happen?  It makes for a very time consuming process to go thru each event on each device to remove this alert.
Some other posts have had a similiar issue with no working fixes. Guess Apple is too busy fixing Maps.   ;-)