Update join.md

Author: Weile-Zheng

config/join.md

@@ -59,5 +59,6 @@ After joining the club, we will host a project exploration fair on **September 8
 After attending, you will be given access to a form to specify your top 3 project choices, from which we will place you into your preferred project (subject to constraints and appropriate difficulty).
 
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-    ⚠️ You **must attend** the exploration fair to be placed on a project this semester. If you are unable to attend but would still like to participate in projects, you must [email us](mailto:[email protected]) in advance letting us know, and we will consider your request on a case-by-case basis. If emailing us, please include `[EXPLORATION FAIR]` in your email title.
+    ⚠️ You **must attend** the exploration fair to be placed on a project this semester. If you are unable to attend but would still like to participate in projects, you must [email us](mailto:[email protected]) **in advance** letting us know, and we will consider your request on a case-by-case basis. If emailing us, please include `[EXPLORATION FAIR]` in your email title.
+    We will not consider cases with an absence email sent after the exploration fair. 
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