Update _redirects

Signed-off-by: Matty Widdop <18513864+MattyTheHacker@users.noreply.github.com>

Author: MattyTheHacker

_redirects

@@ -90,4 +90,5 @@
 
 /supervisor-opinions https://docs.google.com/document/d/1jyzgp8ScrmvVpf8k0EplTuvflxqqbcY3LJoQX0Tg8jc/
 
-/bbq-form https://forms.gle/pwygMk3M9kpBrGro7
+/bbq-allergies https://forms.gle/pwygMk3M9kpBrGro7
+/bbq https://www.guildofstudents.com/events/6531/11174/