maybe you can try to use placeholder #_ATT{field_id} under Events > Settings > General > Full Calendar Options > Event title format ?
This works with text fields. But i have image field. Event title format do not support html, and i cant add <img> tag.
And another one. I’d like add one icon for not Recurring events, and another one for Recurring events. Is it possibly?
you could use conditional placeholders like {is_recurrence}
as for allowing html, see Angelo’s comment here -https://wordpress.org/support/topic/wp_fullcalendar-and-not-recurring-events-1?replies=3#post-7373359
After update to v 1.0, all this does not work.
did you already try add again the custom javascript included in the link above?
Yes. I add again all custom javascript.