I received an email from a mailing list which I have subscribed, which had links to several books on Hinduism. As I was browsing through the content of the web site which had several important books scanned, I found this simple and very well explained book which has details of all the festivals, the rituals which needs to be followed and so on.. This book is in Kannada. You can read the book online or even download a PDF file, whichever is convenient to you all.
Attached below is the link for the book:
P.S: The details for all the many festivals coming during Shravan Masa starts from page 32 onwards.