I don't think anyone was suggesting two-three new full length trailers within a month of each other.Yeah, if there was a new trailer at one event per month, I think that would be enough. So maybe E3, SDCC, Gamescom, TGS, Paris Games Week/PAX Aus, and then it could release in November. Five-six trailers would be more than enough coupled with some social media teasers and magazine features.
I just don’t think it’s necessary to see two-three new full length trailers within a month of each other.
I’d like two-three more world reveal trailers, one or two story trailers, and a final trailer that features quick non-spoiler shots of a bunch of Disney characters and short bits of gameplay from the various worlds, possibly teasing MX for the first time.
The schedule probably looks like this:
E3 - Demo / Trailer
SDCC - Demo
Gamescom - Demo / Trailer
PAX West - Demo
TGS - Demo / Trailer
NYCC - Demo
Paris Games Week - Demo / Trailer (opening?)
PAX Aus - Demo
That's four trailers, and the closest would be TGS and PGW since those would be a month apart and TGS needs to have a big blowout for the Japanese market.
There's probably events out there that I have forgotten about, but like the 2.8 demo, this one should be taken around to as many conventions as possible so if OP wants to plan an alternative surprise for his sister's birthday, maybe it could be tickets to a different event (with parental supervision since none of those take place in Los Angeles).