Specific events will be more tricky because you’ll need a way to flag those specific events. Here’s what I would do:
1. Install http://www.advancedcustomfields.com/ and then create a True/False field displayed in the events add/edit screen to be able to flag those events.
2. Then, modify single.php as I instructed with the following change to lines 21-29:
https://gist.github.com/4435986 – note, you’ll need to create the true/false field with Advanced Custom Fields and set it to display for the Events (tribe_events) post type and then update the code to reflect your custom field unless you use the same label/field name as I used (custom_event_date_display).
So basically what this is doing is just checking for whether or not that flag has been set for specific events and displaying a different start/end date without time in the single.php template. I know it’s a bit much but hopefully you can figure it out and if you have any questions, let me know.
Cheers,
Jonah