The conclusion aboard the Enterprise-D of a treaty between the Federation and the Legarans, the last achievement of Ambassador Sarek, who had spent ninety-three years working towards it.
In The Next Generation episode Sarek, the Enterprise-D carries the celebrated Vulcan ambassador to meet the Legarans, an exacting people who will deal with no one else and who require a special pool to be built for them on board.
As the ship travels, tempers flare among the crew and a brawl breaks out in Ten Forward. Doctor Crusher and Troi trace the cause to Sarek himself. At 202 he has Bendii Syndrome, a rare illness that destroys a Vulcan's emotional control, and he is projecting his feelings telepathically. His wife Perrin and his aides have been shielding him from the truth.
Picard confronts him, and Sarek's composure breaks. To get him through the talks, Picard agrees to a mind-meld that lends Sarek his own stability while Picard endures the ambassador's unleashed emotions, including his unspoken love for his family. The agreement is concluded.