Barring outsiders, try second event: get to assemble again (9)

'to assemble again' is the definition.
('convene' is an answer for 'to assemble' so perhaps 'reconvene' is OK for 'to assemble again')

'barring outsiders try second event' is the wordplay.
I cannot quite understand how this works, but
'second' could be 're' (prefix meaning second in eg review, re-education) and 're' is found in the answer.
The remaining letters 'convene' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'get' is the link.

Can you help me to learn more?