Edit in JSFiddle

import { CIQ } from "https://jsfiddle.chartiq.com/chart/js/advanced.js";

// Activate the License Key
import getLicenseKey from "https://jsfiddle.chartiq.com/chart/key.js";
getLicenseKey(CIQ);

import sampleData from "https://jsfiddle.chartiq.com/chart/examples/data/STX_SAMPLE_DAILY.js";

const stxx = new CIQ.ChartEngine({
  container: document.querySelector(".chartContainer")
});

function showEvents() {
  const markerTypes = ["dividend", "news", "earnings"];
  let newNode;
  
  for (let i = 0; i < stxx.masterData.length - 10; i += 5) {
    let r = Math.floor(Math.random() * (markerTypes.length + 1));
    if (r == markerTypes.length) continue; // randomize
    newNode = document.querySelector("#stxEventPrototype").cloneNode(true);
    newNode.id = null;
    newNode.innerHTML = markerTypes[r].toUpperCase().charAt(0);
    newNode.classList.add(markerTypes[r]);
    new CIQ.Marker({
      stx: stxx,
      xPositioner: "date",
      yPositioner:markerTypes[r] == "dividend"?"under_candle":"above_candle",
      x: stxx.masterData[i].DT,
      label: "events",
      node: newNode
    });
  }

  // future marker with ckickable link
  newNode = document.querySelector("#stxRhombusPrototype").cloneNode(true);
  newNode.id = null;
  newNode.innerHTML = '<a href="http://www.chartiq.com" target="_blank">Y</a>';
  newNode.classList.add("rhombus");
  let someDate = new Date(stxx.masterData[stxx.masterData.length - 1].DT);
  someDate = stxx.getNextInterval(someDate, 5); // 5 bars in the future
  new CIQ.Marker({
    stx: stxx,
    xPositioner: "date",
    //yPositioner: "above_candle",
    x: someDate,
    label: "events",
    node: newNode
  });

  //hover marker
  newNode = document.querySelector("#stxEventHover").cloneNode(true);
  newNode.id = null;
  newNode.querySelector(".content", newNode).innerHTML = 'H';
  newNode.querySelector(".tooltip", newNode).title = 'Hover';
  newNode.classList.add("hoverMarker");
  someDate = new Date(stxx.masterData[stxx.masterData.length - 5].DT);
  someDate = stxx.getNextInterval(someDate, 1); // 1 bar in the future
  new CIQ.Marker({
    stx: stxx,
    xPositioner: "date",
    //yPositioner: "above_candle",
    x: someDate,
    label: "events",
    node: newNode
  });

  stxx.draw();
}

stxx.loadChart("SPY", sampleData);

showEvents();

<link rel="stylesheet" type="text/css" href="https://jsfiddle.chartiq.com/chart/css/stx-chart.css" media="screen" />

<div class="chartContainer" style="width:100%;height:400px;position:relative;"></div>

<!--[if IE 8]><script>alert("This template is not compatible with IE8");</script><![endif]-->

<div id="stxEventPrototype" class="myEvents">
</div>

<div id="stxRhombusPrototype" class="myEvents">
  <span class="shape"></span>
  <span class="label"></span>
</div>

<div id="stxEventHover" class="myEvents">
  <span class="content"></span>
  <span class="tooltip"></span>
</div>

.myEvents {
  position: absolute;
  text-align: center;
  width: 20px;
  height: 20px;
  line-height: 20px;
  color: white;
}

/*style dividents to be a blue circle*/

.myEvents.dividend {
  background-color: blue;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  border-radius: 50%;
}

/*style news to be a small red square*/

.myEvents.news {
  background-color: red;
  width: 15px;
  height: 15px;
  line-height: 15px;
}

.myEvents.earnings {
  background-color: purple;
  border: 5px solid yellow;
}

/*style to be a brown Rhombus*/

.myEvents.rhombus .shape {
  position: absolute;
  width: 20px;
  height: 20px;
  left: 0px;
  background-color: yellow;
  border: 2px solid black;
  color: black;
  -webkit-transform: rotate(45deg);
  /* Saf3.1+, Chrome */
  -moz-transform: rotate(45deg);
  /* FF3.5+ */
  -ms-transform: rotate(45deg);
  /* IE9 */
  -o-transform: rotate(45deg);
  /* Opera 10.5 */
  transform: rotate(45deg);
}

.myEvents.rhombus .label {
  position: absolute;
  width: 20px;
  height: 20px;
  left: 2px;
  /* offset to center the label */
}

.myEvents.hoverMarker {
  background-color: pink;
  border: 2px solid black;
}

/*  create some rudimentary styling for our tooltip class */

.tooltip {
  display: inline;
  position: relative;
}

.hoverMarker:hover .tooltip:after {
  background: #333;
  background: rgba(0, 0, 0, .8);
  border-radius: 5px;
  bottom: 26px;
  color: #fff;
  content: attr(title);
  left: 20%;
  padding: 5px 15px;
  position: absolute;
  z-index: 98;
  width: 30px;
  content: attr(title);
}

.hoverMarker:hover .tooltip:before {
  border: solid;
  border-color: #333 transparent;
  border-width: 11px 6px 0 6px;
  bottom: 20px;
  content: "";
  left: 50%;
  position: absolute;
  z-index: 99;
}