Hello there Teri R.,
It looks like it may be a good idea to remove the Gmail account from the iCal preferences, restart the computer, and then re add the account.
Highlight the account in the iCal preferences, and press the - down below.
After restarting the computer re add the account with this article:
iCal 5.x: Set up a calendar account in iCal
Set up a Google or Yahoo! account
- Choose iCal > Preferences and click Accounts.
- To add a new account, click Add + in the lower-left corner.
- Enter your Google or Yahoo! email address and password, and then click Create.iCal finds any calendar accounts associated with the email address you provide.