Hello!
I can’t check your website because it redirects to my local IP so please whitelist me.
Currently the theme shows only the start date of an event. What I suggest you is to add your details inside the event description, just below the event details.

If you need to highlight your multi-day event on title or event details you will need to customize the source code but this goes out of the support territory.
What I can do is to talk with our developers and point you to a possibile solution.

Regarding WPML, yes it does duplicate all your pages as the number of your languages.
If you have 2 languages, WPML creates a copy of the first page and set it as the second language.

Then, all the strings you wrote (buy tickets, you may also like and read more) are fully translatable. You should find them under your translation file inside WPML.

If you are in trouble with WPML, you could try Polylang (https://wordpress.org/plugins/polylang/)

Last but not least, I always suggest our customers to check this page manual regargiding theme translation: http://www.themes2go.xyz/manuals/lifecoach/knowledge-base/translating-the-theme/

Hope this helps you. If you need more support on these just let me know replying below.

Best,
Andrea