Hi!
I've just made a simple workflow of my Alfred 1 extension to show the current calendar week, grab it here:
http://uwh.se/alfred-current-calendar-week.html
Read this:
The current timezone is set to Europe/Stockholm, please change it to your own after downloading the workflow.
Edit:
I've created two different alternatives, you can either choose to show the result as an inline result or an notification.
Best Regards.