Hello Cindy,
Welcome to the forum and I'm glad to hear you find the site useful.
Regarding the calendar module, this is probably a 3rd part module as it does not come with the standard default version of DNN.
If you are receiving errors with this module i can't really provide any information as I don't know who created it etc.
Which version of DNN are you using? - Go to the Host menu / Settings to find out.
The Events module has changed a lot since v3.1 in the latest 4.3.5 version there are a lot of new features for changing the configuration of the module.
The other option is to look on
snowcovered.com for a module that suits your needs, there are many events type modules out there - just make sure that you purchase a module for your DNN installation version.
Thanks,