Lunar eclipses happen regularly. A blood moon is just a poetic way of saying "lunar eclipse".
The Jewish calendar is a lunar calendar, lunar eclipses occurring on Passover and Sukkot happen regularly--about 1/6 of all lunar eclipses will take place on Passover and Sukkot.
"Tetrads" happen rarely, but have happened many times before, about 8 have taken place in the last 2,000 years. They do not signify anything, it is just statistically uncommon.
Astrology is condemned in Scripture. Astrology is the attempt at divining meaning from the movement and position of celestial bodies--the sun, moon, and the stars. Using lunar eclipses to try and divine future portents, or read into them signs of significance is astrology--it is divination, and it is condemned in Scripture.
John Hagee and the whole "blood moon prophecy" thing is an exercise in divination, magick. More than that, it is just another hoax, another bill of lies from fraudulent hucksters and swindlers.
When all is said and done, and nothing happens, Hagee and other prophecy-peddlers will continue the same as they always do. Nobody will hold them accountable, they will continue to preach their lunacy, they will continue to deceive Christians.
It is important that we as Christians speak out against these things. That as Christians we people a truthful people, a truth-speaking people. That we learn facts, that we have an informed opinion, that we do not get taken in by the latest fad, the newest con. There will always be con-men, hucksters, and snake-oil salesmen; it is our job to be an informed people and to speak up and against the snake-oil and those who peddle it. God will be their judge, but we have a responsibility toward others that we speak against it, to speak truth, to denounce lies.
Christ is not glorified in the swindle, in lies.
Do not be fooled. Do not be taken in. Be stalwart and sturdy. Confess the faith, speak the truth, reject falsehood.
-CryptoLutheran