Looking to identify sci-fi magazines/comics from the 60s and 70s

Maybe someone can help me identify the mags/comics I came across written in the 1960s or 1970s. There were a couple stories in comic book format:

1) One was about a kid receiving a radio signal from an alien space ship. He alerts the military and it becomes a media circus and vendors and hot dog sellers all show up. As they are about to land, they land in some hot lava and are destroyed by giant rocks, and it turns out their ship was minuscule and landed in a hot dog and were eaten by the general.

2) Another was about two couples having Thanksgiving dinner and musing on how humans might just be a form of livestock. This turns out to be true and one of the attendees is “harvested” and the others are “mind-wiped” and do not realize she is taken even while it is happening.

Been telling my kids about this for years, but can’t track down those older comics. They were in black and white (no color) and were a smaller format, about 6-8″ in size. They were not in actual comic-book format, but reminded me of the older pulp mags.