一定成功的

Given the distance between my previous role as a convention gate-crasher and my newfound role as convention keynoter, I had some cause to worry that my appearance in Boston might not go very well.

我在届大的角色是擅闯，而这届大是主要发言人，由于这两个角色的巨大差距，我有一定的理由担心，我在波士顿的登也许不十分成功。