I have the Tamron 35-150mm and it is excellent for such events. The only downside is the variable aperture when using flash. If you are using TTL is is OK, but not as convenient with Manual flash settings. Your wide-angle lens will likely be useful for the dance floor. IMHO, the distortions would be too great for group shots.
Actually, today, if I was shooting a wedding (something I vehemently try to avoid ), I would mostly use my stunning new GM 28-70mm f2 (the one I would rent, if I were you). You could also rent the GM 50-150mm - another stunning lens I am growing to love.
), I would mostly use my stunning new GM 28-70mm f2 (the one I would rent, if I were you). You could also rent the GM 50-150mm - another stunning lens I am growing to love.