I for one would strongly advise for the Summit to be held outside of Kumari in some neutral country that has expressed neither support for or against the Camps. Nations that have come out against the Camps are already not trusting the Kumari government in regards to its own people so trusting it with representatives of nations is going to be a huge stretch, this is only furthered by the lack of security from attending nations.
Furthermore I would recommend this summit be focused on eliminating the camps rather than limiting the Fascists. The Prosperity Alliance which has levied sanctions against Kumari won't attend an anti-fascist summit because we don't take a stance no the issue as a bloc. The PA maintains neutrality and is open to dealing with Fascists just like its open to dealing with Communists because open dialogue allows prosperity (least that is our belief). So if you want a Rep from the PA present then the Summit can't be about anti-fascism and how to limit their power and such.
The PA is only interested in closing these camps.
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For example situations ongoing in a nation on Earth typically means a neutral place, like Switzerland is chosen to host a summit. Or Canada in regards to US-Cuba relations. This allows for both sides to be on neutral ground and thus presents no inherent negotiating advantage to either side.