Do as #15 above.
You have applied all the patches in the README as regards uc_reports_products?
Have you enabled the Menu Item Catalog? (Disabled by default)
Also, I created new terms under the event content type to group my events. I use those as menu links (My Catalog).

You are probably fine if creating events and pricing already.
But, from the Calendar, you will only see a list of the events for the particular date with no cart Link.
Click on the event (Must be a paid event) to be led from the calendar page to the node with a cart link.
Hope that helps.