Final answer:
Without additional context, the reason for Grant being called to Henry Patchett's is uncertain but could relate to the political urgencies of his presidency, like the Belknap Scandal where Grant accepted Belknap's resignation amidst corruption allegations.
Step-by-step explanation:
The context surrounding why Grant was asked to come up to Henry Patchett's is not provided in the excerpts, but it can be potentially linked to a historical event related to Ulysses S. Grant's presidency. In particular, the scandal involving William Belknap, the secretary of war, suggests that meetings or summons during Grant's administration could relate to urgent matters of political scandal or crisis. The Belknap Scandal embroiled President Grant when Belknap was found to have accepted bribes for awarding lucrative military trading post contracts. When uncovered, the impeachment proceedings against Belknap began, leading to Grant's involvement when Belknap sought to resign, raising suspicions that Grant might have wanted to cover up the incident.