For their graduation ceremony, the high school combined orchestra (both band both string orchestras) played the processional. Before the seniors entered, we played a fanfare. Edward Elgar's Pomp and Circumstance was the processional. After the ceremony, we played Giuseppe Verdi's Triumphant March from Aida as the recessional.
The fanfare and processional went fine, I think. There may have been some tempo inconsistencies, but overall, we played well. However, during the recessional, a slight miscalculation threw the performance off. We timed the recessional to last about three minutes and twenty seconds. The actual recessional took much less. The seniors were all gone when we were still in the middle of our piece. Some instruments stopped playing, and the recessional was never finished. Luckily, the seniors took the audience together with them, so not many people actually cared about the orchestra in the background. But I still regret not being able to complete the piece.