Hey Stacey,
Thanks for reaching out!
I see where you are coming from. The code is still valid, it was developed for the Event Tickets / Event Tickets Plus plugin already. WooTix is simply just the name of the function, it has nothing to do with the outdated WooTickets plugin.
I checked the page and it looks like there was no ticket added to that event. So I would check that as a first.
However, here on the pre-sales forum, I’m afraid we do not provide technical support. Since you / your client have purchased a plugin from us, please login and post your question in the premium forums for that plugin and we can provide you with full, dedicated support there:
https://theeventscalendar.com/support/forums/
Thanks again and cheers,
Andras