Sidebars / widgets missing in Twenty Eleven, but not Twenty Ten

When I was first in process of creating my site I used Twenty Ten. The calendar and pages widgets were able to be seen in the main sidebar. After completing the building of my site, I decided to switch back to Twenty Eleven, but nothing shows up in the sidebar. I like the Twenty Eleven theme better and would like to use it, but not without the sidebars being able to be seen. Help?