What was advertised in a colonial newspaper 250 years ago this week?

“The Portsmouth PACKET sails for Boston next Monday.”
This advertisement caught my eye thanks to its fairly unique format. It ran across the bottom of the three columns on the second page of the July 11, 1766, issue of the New-Hampshire Gazette. It briefly announced that “The Portsmouth PACKET sails for Boston next Monday. Those who incline to go to Commencement may have a Passage, &c.” While it was short on details, the advertisers assumed that readers had sufficient background knowledge to fill in the gaps on their own.
For readers who read or examined this newspaper long after it was published, another advertisement at the bottom of the third column on the facing page told more of the story.

(As an aside, I note that the third page is not the facing page when accessing this issue digitally since only one page at a time can be accessed and viewed. This creates yet another distinction between the manner in which eighteenth-century readers consumed newspapers and modern readers experience their digital surrogates. Researchers working with original newspapers, however, benefit from a better impression of the visual composition of multiple pages in relation to each other.)
This second advertisement revised the schedule for the stagecoach that regularly traveled between Portsmouth and Boston. Instead of leaving on the following Tuesday, it was instead scheduled to depart on Monday “for the better Convenience of those who may incline to go to the ensuing Commencement at Cambridge, on Wednesday next.”
The Commencement ceremony at Harvard College was a significant enough event that the providers of multiple forms of transportation in Portsmouth, New Hampshire, placed advertisements intended to facilitate travel to it and attract passengers. Their advertisements on facing pages created competition between two modes of transportation, a stagecoach by land or a ship by sea.