Why I can’t get gadgets for Google calendar?

I have two solutions for you.

1. first of all try to login in some other computer as it has also help to me so may be work for you too.

2. Second solution is that you can download the Google gadgets checker from Google website and install it in your system. The software will help you check your gadgets through checker to test for the error and problems with your page. You just have to run the source code of the gadgets via Google gadget checker and it will identify the problem in your code and will fix it. This software will test the error from your Gmail account. I am sure you will able to use the google gadgets calendar and all.

You may also try to change your internet browser as it is being seen that the problem usually occurs with Mozilla Firefox so if you are using Mozilla, you should download Google chrome. Cheers!!