Dover Beach in Fahrenheit 451 resembles parallel worlds of dystopia lacking faith and trust.
Read the poem. It is about loss of faith and ignorance. Darkness and loss of faith as Montag learns what he is missing. The allusion leads to why the women cry and what they are missing by losing emotions and reading, without even realizing it.
Montag's reading of "Dover Beach" stirs Mrs. Phelp's emotions which have long been blocked by the city's culture, mass media, etc.
If you are referring to the party when Mildred had her friends over and Montag came in and read to them Dover Beach, the poem, you can find that party in THE SIEVE AND THE SAND, pages 94-101. Hope this is the party you were referring to.
Mrs. Phelps was affected by the original intent of the poetry. She cried when Montag read Dover's poem.
The title of Fahrenheit 451 is Fahrenheit 451. The shorter version of the story was called "The Fireman", which was the basis for Fahrenheit 451. The reason why this book was entitled Fahrenheit 451 is because the temperature in which books burn is Fahrenheit 451.
Fahrenheit 451 is the temperature at which books burn.
Montag dropped the poetry book into his kitchen incinerator.
I know that paper combusts at 451 deg fahrenheit.
Fahrenheit 451 is the heat at which paper burns