Insert won't work due to space in column name

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
$username= "jasmine";

require "connection.php";

$data = isset($_POST['data']) ? $_POST['data'] : false;


if (is_array($data)) {
	// LOOP THOUGH EACH SUBMITTED RECORD
	$updatestr = 'Gathered /By, Date,';
	$update1 = '';
	$update1 .= "'" . $username . "',";
	$update1 .= "'" . date("d/m/Y") . "',";

		foreach($data as $field => $value) {
			$value=mysqli_escape_string($conn, $field);
			$value=mysqli_escape_string($conn, $value);
			$updatestr .= "{$field },";
		

			trim($updatestr, ',');
			
		
		}
		$updatestr= rtrim($updatestr,',');
		foreach($data as $field =>$value){
			$value=mysqli_escape_string($conn, $value);
			$update1 .= " '{$value}',";
			
			trim($update1, ',');
			
		}
		$update1= rtrim($update1,',');
			$query = "INSERT INTO `rsvp` ({$updatestr}) VALUES ({$update1})";
			// SEND IT TO THE DB
			$result= mysqli_query($conn, $query);
			echo "working";


}
else {
	echo "Error occurred.";
}


?>  

Select allOpen in new window

I have this code, but it everything is fine but my only issue is that it won't add into the query since one of my columns have a space : "Gathered By"
this is the output of my query

INSERT INTO `rsvp` (Gathered By,Date ,First ,Last ) VALUES ('jasmine','26/01/2017', 'Jazz', 'Jazz');

Select allOpen in new window

How can I fix this? I cant change the column name, so is there anyother way ?