Update README.md

README.md

@@ -45,7 +45,7 @@ Below is a preliminary schedule for Fall 2024. The schedule is subject to change
 Tue, Aug 27 | Introduction | [slides](slides/w1_1_introduction.pdf) <!-- • [video]() -->
 Thu, Aug 29 | Intro to graph theory | [slides](slides/w1_2_graph_theory.pdf)
 Tue, Sep 3 | Random networks | [slides](slides/w2_1_random_networks.pdf)
-Thu, Sep 5 | Edges vs social ties | [slides]
+Thu, Sep 5 | Edges vs social ties | [slides](slides/w2_2_edge_vs_social_ties.pdf)
 Tue, Sep 10 | Triads and structural balance | [slides]
 Thu, Sep 12 | From social processes to graphs | [slides]
 Tue, Sep 17 | Homophily and degree correlation (part 1) | [slides]