This is a bit late since some of the deadlines have already passed, but nonetheless, here are the deadlines I know of for 2021 editions of the conferences I track for my lists of institutions and researchers active in technical games research. Plus two journal special issues.
Deadlines still in the future (as of April 26):
|2021 May 28||CoG||Short/demo/other papers|
|2021 May 30||ToG||Special issue on Evolutionary Computation for Games|
|2021 Jun 07||ICEC||All papers|
|2021 Jun 07||AIIDE||Research paper abstract registration|
|2021 Jun 14||AIIDE||All papers|
|2021 Jun 25||ICIDS||All papers|
|2021 Jul 16||CHI PLAY||Short/demo/other papers|
|2021 Jul 31||ToG||Special issue on User Experience of AI in Games|
|2021 Sep 06||ACG||Research papers|
Deadlines that have passed:
|2020 Dec 22||I3D||Research papers|
|2021 ||FDG||Research papers|
|2021 Feb 17||CHI PLAY||Research papers|
|2021 ||I3D||Poster papers|
|2021 ||CoG||Research papers|
|2021 ||FDG||Short/demo/other papers|
I might make this a regularly maintained feature in the future, but this is a one-off list for now. Partly so I can stop having to repeatedly search for the deadlines.
There are some other deadlines omitted from the tables above, like workshops, tutorial proposals, doctoral consortia, etc. Click through for the complete CfPs and deadlines.