If you have entered some booking price for the event, then it will always show "$xx.xx". The trick is to make the event free by giving it no price. So, the FREE EVENT label will be displayed. But, this is translatable through INI files. So, you can change the text to "To be Announced " or "Contact Seller"
For this,
- Open {root}/languages/en-GB/en-GB.com_yendifevents.ini
- Search for the key "YENDIF_EVENTS_FREE_EVENT" and give it your own text.
- Save the changes. That's it.
Hope, this solved your issue.