A "serendipitous moment" refers to a lucky and unexpected occurrence that happens by chance and results in a positive or favorable outcome. Full definition
July 26, 2016 • More than four dozen bands played at this year's festival, which was full of serendipitous moments. (npr.org)
And, in one of those rare serendipitous moments when the stars align, the folks at Outward Bound were asking themselves the same question: How could they adapt their skill and community - building program for schools? (edutopia.org)
But the problem with these check ins is that even if his friends were around, they often wouldn't see his notification for hours or days later, and Pleeth wanted to find a way to «make serendipitous moments happen instantly.» (businessinsider.com)