Search for the next date in the database

I am creating a mysql table where it contains the date of an event. The question is as follows: if in the current day there is an event it is highlighted otherwise the next day. would you have any idea how to do it? The query for the current day would be more like fetching the following if it does not have the current day.

$data_atual = date('Y-m-d');
$resultado_evento = mysql_query("SELECT * FROM agenda WHERE data like '%$data_atual%'");
while($linhas_evento = mysql_fetch_array($resultado_evento)) {
    echo "nome " . $linhas_evento['nome'] . "<br>";
}