a)Remove the calendar name:
RightClick > Options > Advanced > Find 'EventList' section > Uncheck 'Show event calendar' > OK
b)Rainlendar's help-file wrote:
"How can I create new skins?
You can find skin format documentation from the Rainlendar's help file. It also contains a step by step tutorial for making a simple xml-format skin.
One possibility is to look at one of the existing Rainlendar skins and see how it's made. Rainlendar2 skin (.r2skin) is just a normal zip archive with different file extension so you can uncompress it after renaming the extension back to .zip. The archive contains few xml files and the resources (images, scripts, ...). The skin.xml file must be in the root of the archive so make sure that when you are zipping the archive after modifications that it doesn't contain any extra folders.
During skin development you can also just unzip the archive into Rainlendar's skins-folder. This way you don't have to zip it again after each change."
So, the .r2skin file must look like: