Shopify theme updates
We sometimes release a new theme version that includes additional features, improve performance and fix bugs. Here's the full list of changes for Venue over the time - Venue theme release notes.
If you haven't made any code changes to your theme or installed an app that has changed your theme code, then your theme updates automatically. If you have made code changes to your theme, then any update won't be automatically applied to your theme. Read more here - Official Shopify article on theme updates
To manually get the latest version of Venue please log into your store, head to the themes area of the admin and click the 'Visit theme store' at the bottom of the themes page in the admin. Search using 'Venue' as the keyword and click on the theme's thumbnail in the search results. You'll see a button with 'Add latest theme version' on the Venue landing page.
This will install an unpublished fresh copy of the theme that doesn't carry over any settings. I'm afraid this means you'll have to re-do your theme/homepage setup, any custom code or any app integrations manually. More info here - After you add an updated theme. Depending on your store setup this might be a bit of work but normally it's well worth it as the latest version has a lot of great new features and bug fixes.
Installing the latest version will not affect your currently live theme so you can make sure all works well before publishing.