Hi George,
now I have set up a proper solution for me. It’s not elegant, but for me it works really fine.
I attached a ticket to a page and set it as frontpage and I added to the ticket template the venue and time. my woocommerce cart is replaced by Bootstrap one page checkout https://de.wordpress.org/plugins/bootstrap-one-page-woocommerce-checkout/
So I have now:
Frontpage -> One page checkout (2 steps)
Now it works as I wanted 🙂
Thank you
Christian