Plugin Conflicting with My Site

Please help! The grey background is too light with the white font – or otherwise make the font black.

I tried adding this code to resolve – did not work:
.tribe-events-single-section {
color: #000000;
}

Site having issue is: http://bostonswimacademy.com/
http://bostonswimacademy.com/camp/stroke-development-camp/

https://wordpress.org/plugins/the-events-calendar/