JSFiddle - React, Tailwind, and code Playground

HTML

<div class="agendaDay apr24">24 April</div>
<div class="agendaDay apr24">24 April</div>
<div class="agendaDay apr25">25 April</div>
<div class="agendaDay apr26">26 April</div>

CSS

.apr24 {display: none}
.apr24:first-of-type {display: block}