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.

上届大会的是擅闯会场者，而这届大会是主要发言人，由于这两的巨大差距，有一定的理由担，波士顿的登场也许不会十分成功。