Hi Sylvia and thanks for getting in touch!
Our Event Tickets and Event Tickets Plus combo will definitely allow you to create tickets and sell them through a WordPress ecommerce plugin, like WooCommerce. The plugins do not integrate specifically with Gravity Forms, but Event Tickets Plus does include custom fields that allow you to collect attendee information on a per-ticket basis.
That said, you could add a Gravity Form to any event post — but collecting that information and tying it to a specific ticket is where the integration starts to fall apart.
Does this help answer your question? Please let me know 🙂
Cheers,
Geoff