I 2019 blev de to Comic Market udvidet fra de da traditionelle tre til fire dage med Comic Market 96 fra 9. til 12. august og Comic Market 97 fra 28. til 31. december 2019.<ref name="Comic Market 96">[https://www.animenewsnetwork.com/news/2019-08-12/comic-market-96-sets-new-summer-record-with-730000-attendees-across-all-4-days/.149969 ''Comic Market 96 Sets New Summer Record with 730,000 Attendees Across All 4 Days''] af Jennifer Sherman. Anime News Network, 15. august 2019.</ref><ref name="Comic Market 97">[https://www.animenewsnetwork.com/news/2019-12-31/comic-market-97-sets-new-record-with-750000-attendees-across-all-4-days/.154936 ''Comic Market 97 Sets New Record with 750,000 Attendees Across All 4 Days''] af Egan Loo. Anime News Network, 31. december 2019.</ref> Udvidelsen skyldtes renovering af Tokyo Big Sight, der gjorde at der ikke var plads til så mange grupper de enkelte dage som ellers. Firmaboderne var desuden blevet flyttet til [[Aomi Exhibition Hall]], ca. 1,5 km væk.<ref name="Comic Market 96" /><ref>[https://www.animenewsnetwork.com/news/2018-08-12/comic-market-to-use-smaller-venue-for-record-4-days-for-2019-events/.135394 ''Comic Market to Use Smaller Venue for Record 4 Days for 2019 Events''] af Egan Loo. Anime News Network, 12. august 2018.</ref> Renoveringen skete forud for [[Sommer-OL 2020|Sommer-OL]] og de [[Sommer-PL 2020|Paralympiske Lege]], der skulle afholdes i Tokyo i sommeren 2020, og hvor Tokyo Big Sight skulle bruges som pressecenter. Af samme årsag var Comic Market 98 blevet flyttet til 2.-5. maj 2020 i ferieugen [[Golden Week]].<ref name="Comic Market 97" /><ref>[https://www.animenewsnetwork.com/news/2017-12-23/comiket-98-in-2020-to-be-held-during-golden-week-at-tokyo-big-sight/.125680 ''Comiket 98 in 2020 to be Held During Golden Week at Tokyo Big Sight''] af Crystalyn Hodgkins. Anime News Network, 23. december 2017.</ref>
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