Activity for KatyBrook

I've purchased my dress, not doing any homework previously on what my style was, got my dress altered, train removed, added straps (i thought i didnt like trains, now i feel differently). And we have a ballroom venue and my dress definitely isn't...

The question of Updo or down... My hair is at such a medium length, the front is about shoulder length and the back is a tad longer. The kind of Updo i would want is a low side bun but I'm worried my hair doesnt have enough volume for a good looking...