Acquired so that they can't be gatekept anymore, simple as. I now own the entirety of the program books as well as all associated flyers, notebooks and book cases. I'll be uploading them all naturally, there are about 20 or so items all together. This particular book covers the main program events as well as happenings one could see / get into upon arrival in the sub-hall of the event - a radio show was held alongside several other activities. The actual Daicon IV opening animation was screened here.
Its important to understand that SF was more than just the inclusionary elements of anime at the time and that this convention had been around since the early 1960s - all manners of SF enjoyers, including fantasy and more, were invited and came to participate.
Scanning services are available! Simply send your inquiry to any of the contacts above and I will get back to you in 24 hours at best. Discord is @Adoggoart