Conditional tags allow you to control where certain content appears. For example, if you wanted some content to only appear on your single event pages then you could use is_espresso_event_single().
Below are the conditionals that are available for Event Espresso 4.
is_espresso_event_archive()
This conditional checks for the event list page (e.g. http://example.com/events/)
<?php if(is_espresso_event_archive()) { echo '<div>This is a test for is_espresso_event_archive()!</div>'; } ?>
is_espresso_event_single()
This conditional checks for a single event page (e.g. http://example.com/events/my-fun-event/)
<?php if(is_espresso_event_single()) { echo '<div>This is a test for is_espresso_event_single()!</div>'; } ?>
is_espresso_event_taxonomy()
This conditional checks for a event category page (e.g. http://example.com/event-category/my-event-collection/)
<?php if(is_espresso_event_taxonomy()) { echo '<div>This is a test for is_espresso_event_taxonomy()!</div>'; } ?>
is_espresso_venue_archive()
This conditional checks for the venue list page (e.g. http://example.com/venues/)
<?php if(is_espresso_venue_archive()) { echo '<div>This is a test for is_espresso_venue_archive()!</div>'; } ?>
is_espresso_venue_single()
This conditional checks for a single venue page (e.g. http://example.com/venues/my-spectacular-venue/)
<?php if(is_espresso_venue_single()) { echo '<div>This is a test for is_espresso_venue_single()!</div>'; } ?>
is_espresso_venue_taxonomy()
This conditional checks for a venue category page (e.g. http://example.com/venue-category/my-venue-collection/)
<?php if(is_espresso_venue_taxonomy()) { echo '<div>This is a test for is_espresso_venue_taxonomy()!</div>'; } ?>
is_espresso_event()
This conditional checks the type of $post_id to determine if it is a event.
<?php if(is_espresso_event()) { echo '<div>This is a test for is_espresso_event()!</div>'; } ?>
is_espresso_venue()
This conditional checks the type of $post_id to determine if it is a venue.
<?php if(is_espresso_venue()) { echo '<div>This is a test for is_espresso_venue()!</div>'; } ?>
Resources: Learn more about WordPress conditional tags