Neither of the shows you posted have been confirmed yet. If you try to sign up for MGC, it says due to COVID, they are not accepting applications... Pinball Expo 2021 has not been announced at all. The info on the web is about the 2020 “virtual event” they did. It’s getting long enough into the year that they will need to announce soon if either of those events are canceled or are actually going to happen.
I know of a few gaming events (this summer) that have been announced and they are still planning to happen but, they are not pinball or arcade related, just video game or toy/comic related.