Insert session variable into MySQL database

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<?php
 
    session_start();
    if(!isset($_SESSION['Username'])){
         header("Location: login.php");
    }  
?> 
 
$eventname=$_POST['eventname'];
$Username = $_SESSION['Username']

$sql = mysql_query("INSERT INTO tbl_name VALUES('','$eventname','{$_SESSION['Username']}')");

echo "You have been added to the event";

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