Update discussion.md

Author: suchzheng2

discussion.md

@@ -121,7 +121,7 @@ The following two are short comments on the above paper. You should read these c
 
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-### Session 7, 3/27(Thur), 3/28(Fri), 4/3(Mon)
+### Session 7, 3/27(Thur), 3/28(Fri), 3/31(Mon)
 
 #### Topic
 Additional Topics: Biomedical Image analysis / Multimodal learning