Three Texas politicians sit at the top of SXSW's similarity graph, and that political cluster is the sharpest structural signal in the data. Similarity here measures how closely two entities' audiences resemble each other in composition — and Wendy Davis (0.96) and Julián Castro (0.93) form one clear peak, joined closely by Beto O'Rourke (0.91) and Joaquin Castro (0.87). The second peak is harder to name by a single subcategory: it spans media channels, travel brands, and B2B firms, with Shea Serrano (0.94) — an author — sitting between the two clusters as a bridge figure.

The top 10 neighbors break down as follows by subcategory: four Politicians (Wendy Davis, Julián Castro, Beto O'Rourke, Joaquin Castro), one Author (Shea Serrano), one Airline (American Airlines at 0.88), one Website (Girlboss at 0.87), one Travel brand (Uber at 0.87), one Blog (Thrillist at 0.87), and one News Publisher (PR News at 0.86). No other Events and Awards entity — SXSW's own subcategory — appears in the top 10. The dominant cluster is unmistakably Texas-adjacent progressive politics, while the second tier reflects a cosmopolitan, media-and-mobility audience.

The two-peak shape suggests SXSW's audience is simultaneously a politically engaged constituency and a digitally connected, urban professional one — two distinct neighborhoods that happen to share the same event.