Step towards SharePoint

https://social.technet.microsoft.com/wiki/contents/articles/31330.sharepoint-using-presaveaction-function-on-custom-list-forms.aspx 

Add the below code in the calendar view page using designer or add using script editor / content editor in the page where calendar view inserted < script src ="http://code.jquery.com/jquery-1.11.1.min.js" type ="text/javascript"></ script > < script type ="text/javascript">     $(document).ready( function () {         setInterval( function () {             $( "a[href*='DispForm.aspx']" ).each( function () {                 $( this ).attr( "onclick" , "openDialog('" + $( this ).text() + "','" + $( this ).attr( "href" ) + "')" );                 $( this ).attr( "href" , "javascript:void(0)" );                 $( this ).removeAttr( "target" );             });         }, 900);     });     function openDialog(title, url) {         var options = {             title: "Calendar - "

SPWeb oWeb = SPContext .Current.Web; StringDictionary headers = new StringDictionary (); string strFromEmailID = "Name to display <" + fromEmailAddress + ">" ; headers.Add( "from" , strFromEmailID); headers.Add( "to" , toEmail); headers.Add( "subject" , _subject); headers.Add( "content-type" , "text/html" ); System.Text. StringBuilder strMessage = new System.Text. StringBuilder (); strMessage.Append(_body); SPUtility .SendEmail(web, headers, strMessage.ToString());