By specifying that you want to summon, I assume you mean using the vanilla command. If so, you can just run the command via console:

Code (Skript):

1. execute console command "/summon minecraft:creeper 0 100 0"

Of course, you can change that to summon an item, change the coordinates, and/or add NBT tags to the end of it to change the summoned item. Note that console commands default to running relative to the main world, the one named just "world". If you want to run it in a different world, you should execute the command relative to a player. So for example, if you want the player to summon a creeper at 0 100 0 in THEIR world whenever they right click, you can do:

Code (Skript):

1. on right click:
2.     execute console command "execute %player% ~ ~ ~ /summon minecraft:creeper 0 100 0"

And it will summon in their world no matter what world it is.

 

I do it in other world lol, now i know, console only in "WORLD".
Thanks for the help!