Ashan,
Please check Countdown in Single Event shortcode:
Replies for tickets on suppota
It seems there is an issue with Countdown and Single Event shortcode. I am going to contact Ashan about this.
So, you want to show events on only friday, saturday, sunday automatically?
I am afraid there is no option for that.
You can open a feature request so that it can get added in our future updates or you can send us a customization job request by creating a new ticket in here and selecting Customization Request as the category.

It seems to be working fine.
You had old version active. I activated 2.8.8 and I can see the calendar normally.
Hello,
Could you check now and let me know?
Do you mean that “multiple occurrences” is a single event that spans multiple days? So something like a 3-day conference might begin in May and end in June, but it’s one single event?
Yes and yes.
And a “repeating event” is one event that occurs at intervals, like “tutoring every Thursday”?
Yes.
Hello,
You can use Visibility Type to show different fields when user clicks on Yes or No:
Try on http://dev.myeventon.com/wp-admin/ > EventON > RSVP > RSVP Form.
No help needed at this time. Version 2.7.3 of Plugin is working for now with WP 5.3. Will submit another ticket if I have problems when I upgrade on the staging site.
We are glad your issue is resolved, if you have any further questions or concerns please create a new ticket.
If you have a moment, we would greatly appreciate if you could kindly leave us a review at codecanyon! from your account > downloads. Cheers!