From my perspective, this lens is ideal for celebrations and events: The high focal length allows some distance from the people and by the comparatively compact design acts not as present as a "thick" zoom lens. Moreover, provided an excellent bokeh at maximum aperture. It is at just 800g relatively easy.
I have not felt as a disadvantage, as long as you have the necessary freedom of movement of the lack of zoom capability. If you need more flexibility, with the 70-200mm, f2.8 certainly better off, but care must also invest twice (and wear).