In order to to import events from the page you need to be the admin of the page. So, first you need to create a temporary access token and then upgrade it to a permanent one. To do this, please follow the instructions below:
First check this link: / Image crop sizes in MEC are like that, as you are using cropped images then you can use full images. Go to following directory and according to shortcode skin open "render.php" file
Transferring your events from other famous plugins will be possible using this section. Simply select the corresponding plugin which is activated on your WordPress along with MEC, choose Events and "Import Options" and import the events.
In order to export events to the Google Calendar, you need to get API key from Google. So, first, you need to create a google calendar API and then put it to MEC settings. To do this, please follow the instructions below: