The most novel venue was perhaps the Thames Tunnel, since it was the first to run under a navigable river. The project did not go smoothly and the men in charge, Marc Brunel and his son Isambard, needed to persuade their backers to keep the money coming. Thus, after the project had been set back not only by a major flood but also by Marc's paralytic stroke, a banquet was held for investors in November 1827. Guests included the Duke of Wellington; the Coldstream Guards provided music; and the event was a great public relations success. Work could continue, and (after several further dramas) engineering history was made.
Our third dinner took place at the top of Nelson's Column, just before Nelson himself arrived at his current vantage point. In 1843, 14 stonemasons with a good head for heights celebrated the completion of the column with a meal atop it. Their dining table was then exchanged for the familiar statue.