First, you need to be logged in. Click on 'Announce Your Events' from the members' menu.

Enter the title and description of the event as usual. Remember to include all the information in the description, including the beginning and end dates and times.

When you get to the part where you enter the dates, enter the first day of your event in the date field and select 'No end date (show start date only).

Click on the plus (+) sign to the right of 'Repeat Event'.

At 'Repeat Method', choose 'Repeat every 1 Week(s)'.

At 'Repeat End Date', choose 'Repeat until' and enter the last date of your event.

This will result in your event being displayed once a week for each week of the calendar in which it occurs.