Glacier Point Amphitheater
The amphitheater, adjacent to the Glacier Point trailhead, hosts star parties on summer weekend nights (see the NPS programs page for the schedule) and is also occasionally home to citizenship swearing-in ceremonies and concerts.
The views here are similar to the views at Glacier Point itself, but the point includes a northern view encompassing the eastern half of Yosemite Valley that the amphitheater lacks, while the amphitheater area has clearer views of Vernal and Nevada Falls. (Here's a street-view panorama taken from near the amphitheater, though it's a late-summer view so you have to look closely to see the waterfalls.)