JSFiddle - React, Tailwind, and code Playground

HTML

<script>
$(function(){$(".btnBlue").click(function(){
    window.location = "https://mysite.com/events.aspx?my=" + $(".inpMonth select").val().toLowerCase() + $(".inpYear select").val();
    //window.location = "https://mysite.com/events.aspx?my=" + $(".inpMonth").val() + $(".inpYear").val();
})})
</script>

<div id="datepicker"></div>
                                   <div class="calendForm">
                                    <span class="inpMonth">
                                        <select>
                                          <option selected="selected">September</option>
                                          <option>August</option>
                                          <option>July</option>
                                          <option>June</option>
                                          <option>May</option>
                                          <option>April</option>
                                          <option>March</option>
                                          <option>February</option>
                                          <option>January</option>
                                          <option>December</option>
                                          <option>November</option>
                                          <option>October</option>
                                        </select>
                                    </span>
                                    <span class="inpYear">
                                        <select>
                                          <option selected="selected">2012</option>
                                          <option>2013</option>
                                          <option>2014</option>
                                          <option>2015</option>
                                        </select>
                                    </span>
                                   <a href="javascript:void(0)" type="submit" class="btnBlue"><span>
   ...