JSFiddle - React, Tailwind, and code Playground

HTML

<title>School Event Calendar</title>
<script src= "http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
<body ng-app="eventApp" ng-controller="todoCtrl">
<center>

<form ng-submit="todoAdd()">
    Event Name: <input type="text" ng-model="todoInput"><br><br>
    Event Category: <select class="category" name="eventtype">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        
    </select><br><br>
    <input type="submit" value="Add to Calendar">
</form>
<br>
<br>

<div ng-repeat="x in todoList">
    <input type="checkbox" ng-model="x.done"> <span ng-bind="x.todoText"></span>
</div>

<p><button ng-click="remove()">Delete Selected Items</button></p>
  </script>
</center>
</body>

CSS

<style>
    body {padding: 10px;}
    .red {color: red;}
    .blue {color: blue;}
    .green {color: green;}
    .yellow {color: yellow;}
</style>

JavaScript

var app = angular.module('eventApp', []); 
app.controller('todoCtrl', function($scope) {
    $scope.todoList = [{todoText:'Football Game', done:false}];

    $scope.todoAdd = function() {
        $scope.todoList.push({todoText:$scope.todoInput, done:false});
        $scope.todoInput = "";
    };
  
    $scope.remove = function() {
        var oldList = $scope.todoList;
        $scope.todoList = [];
        angular.forEach(oldList, function(x) {
            if (!x.done) $scope.todoList.push(x);
        });
    };
});