I’m going to a bunch of conventions this year so i might as well round them all up in one post (Sorry if i already did this!!)
Jaycon 5 - http://jaycon.weebly.com/ (Cosplaying Mary from Ib)
Zenkaikon - http://www.zenkaikon.com/
Otakon - http://www.otakon.com/
Saikoucon - http://www.saikoucon.com/
As for Cosplay wise I’m not really sure except for Jaycon 5.
I’m also not so sure about Zenkaikon.