Pageantry moving across road for outdoor event (6,5)

I believe the answer is:

garden party

I'm a little stuck... Click here to teach me more about this clue!

'outdoor event' is the definition.
'garden party' can be an answer for 'event' (I've seen this before). I'm not sure about the 'outdoor' bit.

'pageantry moving across road' is the wordplay.
'moving' is an anagram indicator.
'across' is an insertion indicator.
'road' becomes 'rd' (abbreviation).
'pageantry' with letters rearranged gives 'gaenparty'.
'gaenparty' going around 'rd' is 'GARDEN PARTY'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for garden party that I've seen before include "Buckingham Palace event" , "Lawn event" , "Social occasion at Buckingham Palace, perhaps" , "Alfresco social event" , "Formal festive outdoor occasion" .)

I've seen this clue in The Telegraph.

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