[ASM & Hex] Editing events in Pokemon Yellow

I plan to make a hack of Pokemon Yellow in the future and I know for the fact that Pikamap sadly does not have event support for the maps.

ClassicMap is the map editor I used in my Pokemon Red Rom Hack and it came with full event support.

I really need to know how to edit specific bytes in Pokemon Yellow because making a hack of Yellow is way harder than making a hack of Red and Blue.

Can someone please help.