Is it possible to....

[MisterManigation]

Have an event deleted after you go to just once? For example:

You look for crystals and if you go to that point again, it won't happen again.

How do you do that?

This is RPGM 1.

[Dreamknight]

Set a switch when you find the crystals.

[Vonwert]

Okie. Say the crystal is in a chest.

Have page 1 - Treasure sprite

Add inventory (crystal)

Then have page 2

Condition - (crystal)

page 2 will have nothing in it.

If you don't want to add an item, then instead of add inventory, do switch 001 on , and page 2 condition would be switch 001 on.