Try this address
McKenna Grace
4154 La Venta Dr.
Westlake Village, CA. 91361

I emailed Landrum Arts if I can send mail and received an automatic answer that they dont handle fan mail requests of any kind.

Hi anto-youth :)

Thank you for your feedback {up} and Sorry for your RTS :(

This address should work :P :

Mckenna Grace
Landrum Arts LA
712 Milam Street
Suite 103
Shreveport, LA 71101
USA

You have been added to the list for the $10 gift certificate.

{star} [url=http://www.fanmail.biz/117219.html]Mckenna Grace[/url] on Fanmail.biz

Fanmail 8)

Hello,

I wrote to McKenna Grace on 8/27/2020 and got a RTS today 10/7/2020
I used the address:

Mckenna Grace
P.O. Box 5386
Ventura, CA 93005
USA

http://surfmypictures.com/image/13893f1f01f67a99/bhpke.html

Is there a different address than the venue to try?