I originally identified this as maple-leaved viburnum, but with further research, it’s looking like this is High Bush Cranberry — based on the size (and shape) of the flowers relative to the leaves. We’ll know for sure in the fall — cranberries will have edible red fruit and the viburnum will have purple black fruit. This is growing everywhere at Centennial. A low shrub. Native to North America, and not a true cranberry, but a species of viburnum.

High Bush Cranberry (Viburnum opulus)