Evocation has 2 main types, evocation where the summoned being can be perceived by people who have not trained their subtle senses, and where the being summoned can be perceived with only the subtle senses.
The first type mentioned here is normally only done by people who are as of yet untrained and want to prove to themselves magic is real, but the skills for that are typically beyond them. I've used this method a couple of times to prove magic was real to people. it's more dramatic than changing the weather normally, but it's easier to do with entities already close to our world. full sight and sound are achievable, even then the spirit is almost never flesh and bone like we are, but a much denser energy form
The 2nd type of preferred by most trained practitioners I know, it is significantly less effort/energy, and you can more easily summon things farther out from us.
The third option is imo the best way, in which you project yourself to the spirit instead of asking/forcing it to come to our world. However, you have to be very careful here. You don't want to do this with anything that could be hostile toward you, or that you don't know the rules of interaction with them and could possibly offend them.