Third places are out, as prices rise. Hosting dinners, craft nights, and book clubs are in.

Emily O'Brien and her friends have been meeting up for book club every month for roughly a year. Rachel Wisniewski for BI Emily O'Brien, 26, said in mid-July that she had about 200 pages to go in "Just for the Summer" by Abby Jimenez, before attending book club at a friend's place the following week. She loves attending the monthly meet-up, which friends take turns hosting at their homes in Philadelphia, a tradition they started roughly a year ago. She finished what she needed to read before…