First year participating in this and I couldn't be more excited. Currently in college so I don't know if I'll be able to complete all 31, but I'm gonna try. All first-time watches. Picks subject to change. Starting on September 15, because starting in October just seems like too tall of an order.

Cinemonster's original list here.

QUICK EASY RULES:

10 'Anniversary Films' (Release years end in an 8, excluding 2018)
ROSEMARY'S BABY (1968)
KURONEKO (1968)
THE BEES (1978)
HALLOWEEN (1978)
PIRANHA (1978)
THE SWARM (1978)
DEAD RINGERS (1988)
MANIAC COP (1988)
PONTYPOOL (2008)
THE STRANGERS (2008)

6 countries
Canada - RABID (1977) | SCANNERS (1981) | THE FLY (1986) | DEAD RINGERS (1988) | PONTYPOOL (2008)
France - DIABOLIQUE (1955) | EYES WITHOUT A FACE (1960)
Italy - EYES WITHOUT A FACE (1960) | SUSPIRIA (1977) | THE BEYOND (1981)
Sweden - THE PHANTOM CARRIAGE (1921)
United Kingdom - THE INNOCENTS (1961) | LIFEFORCE (1985) | THE FLY (1986) | RAVENOUS (1999) | BERBERIAN SOUND STUDIO (2012)
United States - FREAKS (1932) | ROSEMARY'S BABY (1968) | EQUINOX (1970) | THE CRAZIES (1973) | THE HILLS HAVE EYES (1977) | HALLOWEEN (1978) | PIRANHA (1978) | THE SWARM (1978) | MANIAC (1980) | CREEPSHOW (1982) | POLTERGEIST (1982) | CHRISTINE (1983) | RE-ANIMATOR (1985) | THE FLY (1986) | NEAR DARK (1987) | DEAD RINGERS (1988) | MANIAC COP (1988) | RAVENOUS (1999) | THE STRANGERS (2008)

6 decades
'20s: THE PHANTOM CARRIAGE (1921)
'50s: DIABOLIQUE (1955)
'60s: EYES WITHOUT A FACE (1960) | THE INNOCENTS (1961) | ROSEMARY'S BABY (1968)
'70s: EQUINOX (1970) | THE CRAZIES (1973) | THE HILLS HAVE EYES (1977) | RABID (1977) | SUSPIRIA (1977) | THE BEES (1978) | HALLOWEEN (1978) | PIRANHA (1978) | THE SWARM (1978)
'80s: MANIAC (1980) | THE BEYOND (1981) | SCANNERS (1981) | CREEPSHOW (1982) | POLTERGEIST (1982) | CHRISTINE (1983) | LIFEFORCE (1985) | RE-ANIMATOR (1985) | THE FLY (1985) | NEAR DARK (1987) | THE BLOB (1988) | DEAD RINGERS (1988) | MANIAC COP (1988)
'90s: RAVENOUS (1999)

6 films from before 1970
THE PHANTOM CARRIAGE (1921)
FREAKS (1932)
DIABOLIQUE (1955)
EYES WITHOUT A FACE (1960)
THE INNOCENTS (1961)
ROSEMARY'S BABY (1968)

6 films from the following: Romero, Cronenberg, Clive Barker, Terence Fischer, Sergio Martino, Bill Lustig (mix-and-match, or all one)
DEAD RINGERS (Cronenberg)
SCANNERS (Cronenberg)
MANIAC (Lustig)
MANIAC COP (Lustig)
CREEPSHOW (Romero)
THE CRAZIES (Romero)

2 flying things that kill you films
THE BEES (1978)
THE SWARM (1978)

1 silent film as a tribute to A QUIET PLACE
THE PHANTOM CARRIAGE (1921)

1 aquatic menace film as a tribute to THE MEG
PIRANHA (1978)

2 women directed films
RAVENOUS (1999)
NEAR DARK (1987)

1 inanimate object comes alive film
CHRISTINE (1983)

1 film with Barbara Crampton in it
RE-ANIMATOR (1985)

And 2 Tobe Hooper Films (There must ALWAYS be a Hooper film)
POLTERGEIST (1982)
LIFEFORCE (1985)