I tried to put the shortcode on a different page and it shows:
Publishing failed. The response is not a valid JSON response.

Do you have the same issue?
As for Highfield LMS Plugin, could you try adding this to the shortcode to see if it’ll load the first page: cal_init_nonajax=”yes”
Hello,
Thanks for your reply.
I’m sorry but could you specify me where I have to add this shortcode please ?
I tried many places but I have no result :/

Try to explain me with images.
Hello,
I updated Permalinks so now you should be able to see events: https://fiestasanantonio.org/events/san-antonio-cactus-xerophyte-show-sale/?l=L1&ri=0
When I set an event to draft it continues to show up in the roll and it still has an event page.
Could you send us a link to the event so we can check it?
Hello,
1. If you add cal_init_nonajax=”yes” to the shortcode you can show the first page of the calendar: https://www.skilldevelopers.com/606-2/ The problem is that you cannot switch months or open events for some reason.
Could you or may I please try the instructions mentioned in this documentation?
2. It seems that there is some kind of fatal error on the server:
POST https://www.skilldevelopers.com/wp-admin/admin-ajax.php 500
Please follow the instructions in this documentation to activate debug in your site to see any PHP errors recorded that can provide insight on to whats going on. Please reply with a link to debug.log file. If you are not able to do this please send us FTP access to your site so we can do this for you.
3. Thank you for your messages, I am going to assign this ticket to Ashan and he will be able to take it from here and find you a solution. Please allow some time for him to get back to you, we greatly appreciate your patience and thank you for being a eventon customer! Also please disable any IP blocking on your site if there are any.
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Could you check?
If updating doesn’t solve the issue could you please try the instructions mentioned in this documentation to make sure your issue is indeed coming from eventon.
Please also note that you need to restore Educator Coffee Hour in order to test this properly.
Could you update EventON to 2.9?
Please check our test server http://dev2.myeventon.com/events/vir/ and try to RSVP:

After try clicking on http://dev2.myeventon.com/events/vir/var/event_access.
Unfortunately, you cannot show both Past and Upcoming events in Event Slider. Please refer to the shortcode generator: