Step 1: Create a VF page like : New_event_Override:

&lt;apex:page standardController="event" action="{!urlredirect}" extensions="event_override"&gt;
&lt;/apex:page&gt;


controller: 

public with sharing class event_override {
public date custom_date;
public string custom_picklistval;
    public event_override(ApexPages.StandardController controller) {
    custom_date = date.newInstance(2012, 11, 30);
    custom_picklistval = '07:00 AM';
    }
    public pagereference urlredirect(){
    Pagereference page = new pagereference('/00U/e');
    page.getparameters().put('StartDateTime',string.valueof(custom_date.format()));
    page.getparameters().put('StartDateTime_time',custom_picklistval);
    page.setredirect(true);
    return page;
    }
}


NOTE : The way I get the 'StartDateTime' and 'StartDateTime_time' is by going to the input field next to the start right clicking on the field and inspecting element in chrome ( this gives the Id of the field , which we can override) 

can we override start field with custom fields in event object
I was planning to record months ago, with my electric guitar, and yesterday I got myself a guitar rig software and bought some 1/4 to 1/8 adapter jack so that I can plug in unto my laptop's mic hole.

Whenever I plug my guitar cable to the 1/4 to 1/8 adapter then to the laptop I can't hear any sound (past the clicking sound you hear) but when I plug the cable almost halfway of the adapter's body (before the clicking sound) I can hear sound when I play and there's some loud buzzing sound involved.

Any explanations as to why this is happening? 
