Error while trying to show calendar

When I enter an Event in the calendar at the time I am going to view the event the page appears with all the news from the site not the event that I published.
For example, I click to open the 2017 Christmas event and instead of opening the event description the page will appear with all my news. as if the page with the event did not appear.

To publish the Event I am using the The Events Calendar Plugin and my theme is called Lost World.

I also have several errors on my site, it follows:

Notice: The called constructor method for WP_Widget in MY_Twitter is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/html/escolamaieutica.com.br/web/wp-includes/functions.php on line 3894

Notice: The called constructor method for WP_Widget in BlogPosts is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/html/escolamaieutica.com.br/web/wp-includes/functions.php on line 3894

Notice: The called constructor method for WP_Widget in SlideshowGallery is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/html/escolamaieutica.com.br/web/wp-includes/functions.php on line 3894

Notice: The called constructor method for WP_Widget in LWCustomCategory is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/html/escolamaieutica.com.br/web/wp-includes/functions.php on line 3894

Notice: add_object_page is deprecated since version 4.5.0! Use add_menu_page() instead. in /var/www/html/escolamaieutica.com.br/web/wp-includes/functions.php on line 3831