Hi Samuel,
Thanks for reaching out to us on this. Hopefully I can help you out with this one!
Unfortunately there’s no easy way to fix this, but a possible work around is to change the translation for that string. You can do so by installing the Say What? plugin, then add a custom translation by going to ‘WP-Admin > Tools > Text changes’. Original string should be ‘ – ‘, text domain ‘tribe-events-calendar’, context ‘Cost range separator’ and replacement string ‘ / ‘ – all of them withou the quotes of course.
Please let me know if this works,
Best,
Nico