Let's be realistic here.
Aretha Franklin was thought by many to be greatly talented and her hits prove her popularity. But most of those hits were in the later part of the 60's through the late 70's. A couple more were hits in the early 80's.
For many people today, including those under 45 or 50, she was a much-honored and well respected symbol of the previous generation. Her songs except for the anthem song "Respect" and the mid-80's "Freeway of Love" were not, until today, getting any play on classic hits songs... and even then it was only about a quarter of the classic hits panel stations that even played those, and in light rotations.
To expect a classic hits station to play non-stop Aretha is just not realistic. To honor a musical great, for sure. But not to make the station play an hour or more of songs it would not ordinarily, per audience feedback, play.
I'm sure some will read all kinds of hateful things into these statements, but the fact is that there is a place for a tribute and there is a way to do it. Properly done, even if some of the music is out of format, playing a song once an hour with an appropriate preface will be liked even by those who are not great fans of the artist but who respect achievements and talent.
Running a long "special" will only drive away regular listeners and do nothing to acquaint, gracefully, those less familiar with the songs, to her "sound".
Except for morning shows and some sports broadcasts, radio does not create "appointment" listening. That is TV, and even there it is fading with all the DVR and stream options. You do an immediate "special" (which seems to be your favorite radio word) and those who might have listened don't for the most part know about it, and the regular listeners will not find too many songs by one artist very appealing, whatever the reason.
Except on certain older-leaning Urban AC stations, what you suggest benefits nobody. And it's bad radio. It's not "the right thing".