event happen at a specific time

You can try this if statement:

if [get world time block] = (number = to time of day)

then

spawn entity (your custom entity)

Ah, give me a few mins, ill take a quick look

I'll make a new project and i'll export the procedure for you

If you go into logic, then find the one that has 2 empty spaces and an = sign, the get curret world time will work with the dark blue one, not the lighter 1

Here is the procedure: 

https://mega.nz/file/8XNC3a6Y#e0-jJkEvJuGseGokci8k031DIj2smOFkN0wlghiQgBM

I used mega as its the only file transfer system ik and it wouldn't let me put the exported procedure straight into mcreator forums.

If you don't wanna download the file, you can just use the advice i gave prior.

Also if you need any help with having the entity spawn in proximity to the player, then let me know. It may take me a bit to respond, i dont check mcreator too often

Your welcome!