bahhh
Explanation
This is not a traditional SMBC comic strip but rather a promotional image for BAH!Fest London 2023, held at Imperial College. The image advertises the event taking place on November 18 at 17:00 GMT (noon ET), noting that some tickets are still available and a live feed will be posted on bahfest.com. It is signed "Come see me!" by Zach Weinersmith.
BAH!Fest (the Festival of Bad Ad Hoc Hypotheses) is an event created by SMBC creator Zach Weinersmith where scientists and science enthusiasts compete to present the most convincing and entertaining pseudo-scientific evolutionary explanation for a real biological or behavioral phenomenon. Think of it as a science comedy show where presenters craft elaborate, internally-logical-but-deliberately-wrong Darwinian explanations. The name is a play on the common criticism of "just-so stories" in evolutionary biology -- ad hoc hypotheses that sound plausible but are essentially unfalsifiable narrative explanations.
The illustration shows London landmarks reimagined in the BAH!Fest style, with what appears to be a giant lemon-spider hybrid incorporating Big Ben, the London Eye, and other iconic structures. This comic slot was used by Weinersmith to promote his live events, which he periodically does in place of a regular comic strip.