Special event established by drip in FA at April's end (8)
I believe the answer is:
festival
'special event' is the definition.
'festival' can be an answer for 'event' (I have seen 'Celebratory event ' mean 'festival' so perhaps 'event' could also mean 'festival'). I am unsure of the 'special' bit.
'drip in fa at april's end' is the wordplay.
'drip' becomes 'IV' (intravenous drip).
'in' indicates putting letters inside.
'fa at' becomes 'festa' (I can't justify this - if you can you should believe this answer much more).
'end' says to take the final letters.
The final letter of 'april' is 'l'.
'iv' put into 'festa' is 'festiva'.
'festiva'+'l'='FESTIVAL'
'established by' acts as a link.
Can you help me to learn more?
(Other definitions for festival that I've seen before include "Day or time of celebration" , "Period for feasting and celebration" , "Celebratory event" , "Lift vase (anag.)" , "Religious feast" .)