Hi there Gaidi,
Thanks for getting in touch with us and sorry to hear about this issue.
First of all please check if the events slug has not been altered in WP-Admin > Events > Settings > General. If that is correctly set to events but you still cannot access the calendar then, can you please follow the steps described in our Testing for conflicts guide? Also, re-save permalinks (WP-Admin > Settings > Permalinks > Save Changes). This way we can see if this is a problem in our plugin or a conflict with the theme or other installed plugins.
It seems to be an URL/permalinks issue as the calendar is working correctly if accessed via ‘ugly’ URL → http://www.bayviewbc.org/?post_type=tribe_events
Please let me know if this helps,
Best,
Nico