On Thursday 19 April, one of the world’s last remaining absolute monarchs addressed a crowd gathered at a small sports stadium in southern Africa.(The cost of changing a country's name) "Gather" can be either transitive or intransitive when it means "come together". I was wondering if I can use both the present participle and the past participle to modify a noun. For example in the sentence mentioned above, can I use "gathering" instead of "gathered"? Thank you.