RSS Feed Calendar Plugin
This code looks good, I only have 2 minor items from a once over;


I would have a constant for -1 meaning an all day event

var ALL_DAY_EVENT = -1; // &lt;-- Declared somewhere on top
if (position === ALL_DAY_EVENT) {
    ...

This:

if (secondHalf.indexOf("AM") !== -1) {
    var title = secondHalf.substring(secondHalf.indexOf("AM") + 3); //Title if has AM
} else {
    var title = secondHalf.substring(secondHalf.indexOf("PM") + 3); //Title if has PM
}


Declares title with var twice, you should declare title only once, ideally on top before your loop. Also, there is some serious code repetition there. I would suggest something like:

//Declare meridiem and title somewhere higher prior to the loop
meridiem = ~secondHalf.indexOf("AM") ? "AM" : "PM"; 
title = secondHalf.substring(secondHalf.indexOf(meridiem) + 3);