If I traveled overseas and went to an international united nations model (NHSMUN) should I mention it individually in some part of my common app? If so, where would I put it? In my activities section, I mentioned that I was part of the MUN club in my school but I don't think that it seems as important just mentioning that I was a delegate for 3 years.
I think the NHSMUN should be a separate activity in the activities section.
And for your school MUN, it is worth mentioning that you have been a delegate for years. They like activities with high time-commitment, especially if you got any awards in it.
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