[文法] 這個關係子句是怎麼來的？

[schickiam (schick)]

句子如下

Because fewer than five people have registered
for the Computer Graphics Workshop to be held two weeks from now,
                                   ^^^^^^^^^^^
                                   這裡是形容詞子句的省略嗎??
                                   如果是，是怎麼來的??

                 .....the Computer Graphics Workshop which will be held.....
                                                        (is going to)

                                   為什麼不是變成下面這樣子?
                 .....the Computer Graphics Workshop being/be held.....


the Training Department manager has decided to cancel the event.


感謝指教。

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