CiviCRM DOES store that information, but doesn't expose it to the user interface. So you have two choices:
Check with SQL. This will give a list of all events with creators:
select ce.id, ce.title, cc.display_name from civicrm_event ce JOIN civicrm_contact cc on ce.created_id = cc.id;
Add WHERE ce.id = x before the semicolon at the end to just show a ...
Looking at the backtrace it looks like its a bug in Fancy Tokens extension. There is a new release for this extension. Try after upgrading the extension to 5.1 if you can still replicate the bug.
There is a fix (work around). It is only needed for users on Joomla. And that is the java fix- Go to System Settings / Resource URLS. Change the path for CiviCRM Resource URL to be /administrator/components/com_civicrm/civicrm/
I am not sure if I understood this correctly. Instead adding participant count limit to price field i would use Event setting to define maximum participant count.
I would create two required price field option of type radio
Event ticket fee
Define max count to 15 in events Info and Settings.
To support partial payment on Event fee you can ...
We have a client that runs a child after school care STEM program. Monies are due at the time of registration (one month eg in May) and then monthly (starting in Sep) for additional 9mo;
We use webfom civicrm (of course! 😀) with iATS payments to:
1) sign up for the Event and detemine the participant fee (conditionals factors are age, number of days, time-...