Google Script for choosing the random name of the survey winner used in meetup.

PrizeLottery

function onOpen(e) {
  // Where the menu button defined
  SpreadsheetApp.getUi().createMenu('Vuetiful').addItem('추첨~ 얍!', 'randomPick').addToUi();
}

function randomPick() {
  var sss = SpreadsheetApp.getActiveSpreadsheet();
  var ss = sss.getSheetByName('Form Responses 1');    // <- Check the sheet name
  var range = ss.getRange(1,1,ss.getLastRow(), 3);    // <- Check the last parameter: how many cells to fetch (first 3)
  var data = range.getValues();
  var pickNum = 0;
  
  for (;;) {
    pickNum = Math.floor(Math.random() * data.length);
    if (pickNum != 0) {
      break;
    }
  }

  SpreadsheetApp.getUi().alert("축하합니다~ "+ data[pickNum][1] +"님!")
}