You can use iCal on your Mac to manage your personal and professional schedules. You can also sync your iCal calendar to your iPhone to view your schedule from your handset. The iCal software supports adding attachments to an event you create on your calendar and has a straightforward way of doing so. However, Google Calendar users cannot use the "Add Attachment" feature and must add attachments through the URL bar on the event.
How to Add Files Through the Attachment Field
Open the iCal calendar. Select the event you want to add an attachment to from your calender, and double-click on the event name. Click "Edit" to open the event editor.
Click the "Add File" option next to attachment on the event editor. Double-click the document you want to attach on the document's list, and click "Open." The document will appear on the event as an attachment.
Select the check box beside "Allow Others to Manage Files" to allow attendees to add or remove files from the event. Click "Save" to save the attachment to the event.
Sync your iPhone through iTunes to update the iCal application on your handset.
How to Add Attachments Without the Attachment Field
Open your iCal calendar. Double-click on the event name, and click the "Edit" button to open the event editor.
Open your documents list on your computer. Scroll to the document you want to add as an attachment.
Click on the name of the document. Drag the document to the URL bar on the event editor, and release the mouse button to drop the document into the URL bar. Click "Save" to save the calendar event. When viewed, the attachment appears as a hyperlink, which you can click to view the document.
Sync your iPhone through the iTunes software to update iCal.
To see a preview of any event attachments, click the "Attachments" link, and press the space bar. A short preview of the attachment will appear.