drupal commerce multiple products on one page
On your Product Display field setup a multivalued  entity reference field of type 'node'. Now as per your example


you add a product for date 18, in reference field add reference to other dates as well.
For all dates will have reference to each other.
Now with view create a block display to show related nodes using relationship on reference field and take node id from context filter.
Put this block on product display page so it can take node id from context and show related products.