function getEvents(){
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = ss.getSheetByName("sheet1");
var start_time = sheet.getRange("L5").getValue();
var end_time = sheet.getRange("N5").getValue();
var cal = CalendarApp.getCalendarById("calender ID");
var events = cal.getEvents(new Date(start_time), new Date(end_time));
for(var i = 1;i<events.length+1;i++){
var title = events[i-1].getTitle();
var start_time = events[i-1].getStartTime();
var end_time = events[i-1].getEndTime();
var loc = events[i-1].getLocation();
var des = events[i-1].getDescription();
sheet.getRange(i+1,1).setValue(start_time);
sheet.getRange(i+1,2).setValue(end_time);
sheet.getRange(i+1,4).setValue(title);
sheet.getRange(i+1,5).setValue(loc);
sheet.getRange(i+1,6).setValue(des);
}
Logger.log("Events have been added to the Spreadsheet");
}