Hey gabba,
These can be used within any loop really, “tribe_is_event()” can also be used outside of the loop if you pass a post ID to it so it will check if the associated post is an event. The other two are conditionals specifically for certain views of the main calendar page.
If you’re noticing that nothing is being returned, try following the Themer’s Guide and copying the views > month > single-event.php file into your theme and try using the conditionals there. Within this file, if you use the “tribe_is_month()” conditional it should return true.
Let me know if that works for you.
Thanks!