On this day in 1967 soprano Elisabeth Grümmer made her Metropolitan Opera debut on tour in Boston, as Elsa. 

Michael Steinberg in the Boston Globe:

Elisabeth Grümmer, better known in America from records than through actual performance, brought to the role of Elsa an appropriate radiance of person, a clear and bright soprano used with good reserves of power, a technical finesse and with intelligent sense of text, and exquisite musical art. It was a performance that would have been valuable and lovely under any circumstances; coming as it did, from a woman of 56, it was a remarkable one as well.