Import calendar from excel to outlook

I have information in an Excel document that I want to import into an Outlook calendar. Any idaes on how I can go about this? I am using Office XP. Here are the fields that the Excel doc have that should map to the Outlook calendar.
Excel Outlook
Name Subject
SubD Location
Walk-thruD StartDate
Walk-thruT StartTime
Lot Description
Not sure how I have to format the Excel doc.

I get a message that says to use excel to name the ranges but i treid to export a calendar into Excel and the manually enter the data and import that into outlook and it said that it completed but the calendar was blank. Thanks for your help.