Fair enough. For me, it's a celebration of completing the job search. The benefit for the group is to show there is a lot of rejection even in a successful search. Seeing other people's reminded me of that.

PreSales is an annoying description that doesn't describe the role. It's also known as "Technical Sales", "Sales Engineering" or "Solutions Consulting". It boils down to supporting the sales team with product demonstrations, technical knowledge, and questionnaires, typically in B2B software. If you've ever seen "A hologram for the king", it's the people on Tom Hank's team that sit in the tent and prepare the hologram.