Have you seen this thread?
https://www.disboards.com/threads/how-to-see-all-the-shows-parades-etc.3968771/
Sun. - 8:30 PTN
9:30 Halloween Screams with fireworks
10:30 Fantasmic show (with or without dining package)
If you are trying to do this all in one night, I would not do the parade dining package. While it does guarantee you a viewing location for the parade, you are facing the train station which is the opposite direction of the fireworks. You will need to get up, turn around and walk towards Main Street to view the fireworks. If you watch the parade from Main Street, as soon as the last float finishes, everyone rushes to the middle of the street for fireworks. It isn't like you will get trampled, but be prepared for the mass movement. Main Street is very crowded for fireworks. Even if you got positioned behind someone who seems shorter, there is no guarantee they won't put a child on their shoulders or hold their phone above their head to film the show. After that, you will need to fight the masses of parade viewers to get to Frontierland to work your way to Fantasmic. Note that they use Adventureland as the exit route for people who watched the first show. Those who want to watch the 2nd show will be directed to enter via Frontierland.
Personally, I think your best bet for this night would be to watch the first Fantasmic show with a dining package. Immediately following Fantasmic, you can watch fireworks and projections from your dining package location. Fireworks end around 9:45 pm. After that, I would make my way towards Small World (or anywhere between the Partners Statue and Small World) for the second PTN viewing which starts 10:30 pm. I would tell you to work your way to Main Street, but even for the second viewing, it gets crowded.
Mon. - WOC (only night we can go because of OBB)
If you have not seen WOC, I would not have my first viewing be from Lamplight. If you don't want to do the dessert or dining package, I would do the VQ or watch from the Pixar Pier bridge. As it is with other entertainment, the second show is less crowded than the first. But less crowded doesn't mean empty. There will be others in the same situation as you, where Monday is their only night to watch WOC.
Tue. - *8:30 or 10:30 PTN (if we don't get to it on Sunday)
You might consider watching the first parade from Small World. Fireworks and projections can be seen on/over IASW approx 30 min after the parade ends. Most people rush to the center of IASW to view the fireworks and projections. I think the view is better if you are towards the right of center. After fireworks, you can watch Tapestry of Happiness and then head into Toontown when it reopens.
If you really want to get in Shadows of Memory on that night, let me know and I can talk you through what path to take to get there.