You could use custom CSS to set the colors.
For example, for a dark backgroound, the title color for a calendar listing is usually set using something like:
.tribe-events-single-event-title {
color:#ffffff;
}
Your current Calendar page has this CSS for the titles:
.tribe-events .tribe-events-calendar-list__event-title-link:active, .tribe-events .tribe-events-calendar-list__event-title-link:hover, .tribe-events .tribe-events-calendar-list__event-title-link:focus, .tribe-events .tribe-events-calendar-month__calendar-event-title-link:active, .tribe-events .tribe-events-calendar-month__calendar-event-title-link:hover, .tribe-events .tribe-events-calendar-month__calendar-event-title-link:focus, .tribe-events .tribe-events-calendar-month-mobile-events__mobile-event-title-link:active, .tribe-events .tribe-events-calendar-month-mobile-events__mobile-event-title-link:hover, .tribe-events .tribe-events-calendar-month-mobile-events__mobile-event-title-link:focus, .tribe-events .tribe-events-calendar-month__calendar-event-tooltip-title-link:active, .tribe-events .tribe-events-calendar-month__calendar-event-tooltip-title-link:hover, .tribe-events .tribe-events-calendar-month__calendar-event-tooltip-title-link:focus, .tribe-events .tribe-events-calendar-day__event-title-link:active, .tribe-events .tribe-events-calendar-day__event-title-link:hover, .tribe-events .tribe-events-calendar-day__event-title-link:focus, .tribe-events .tribe-events-calendar-latest-past__event-title-link:active, .tribe-events .tribe-events-calendar-latest-past__event-title-link:hover, .tribe-events .tribe-events-calendar-latest-past__event-title-link:focus {
color:#a8bd38;
}