The dress is beautiful! Yes, you can wear it to a wedding. I wouldn't worry about over powering the bride either. You're dress has black flowers in it. It's will be fine to wear to a summer wedding. Someone in my family once wore white to a wedding and she looked beautiful. She didn't over power the bride either. The bride never complained about her dress. Your dress sounds so cute and I would wear it to a summer wedding regardless of what others might tell you. Having a little bit of white in your dress isn't going to matter.
There are many brides who care too much about what others wear to their wedding. I honestly don't care because I'm someone who doesn't like judging others. When I get married next year and one of my family members decides to wear white, I won't worry about. The fact that they came to the wedding to support my fiance and I is the best gift I could ever receive. Too me, it's no big deal. Brides, need to learn to just let it go. It's so selfish to think that brides are so worried about how their guest will dress. Men, where white dress shirts to weddings and yet no one complains about that at all.
Getting married in 10 months. :)