concert going is fantasitic 这里的going怎么理解?

concert going is fantasitic 这里的going怎么理解?
Concert going is fantasitic 这里的going怎么理解?是动名词,还是名词或者其它词性?这句话和 Going to concert is fantasitic是一个意思吗?
我懂了，其实这个句子可以变成 Concert which is going is fantasitic.
= > Concert (being) going is fantasitic.说明 Concert 正在进行。