Practice. Out loud. Lots of times. Until you know what you need to say for each slide and it doesn't matter if you don't have notes. Until you're thoroughly bored with it. Confidence comes from knowing your stuff backwards.
Remember that no-one else knows what you've forgotten if you miss a bit.
Try to remember why this stuff is interesting and convey that interest to your audience. Authenticity will get you a long way!
Do you use presenter view in PowerPoint? It's great because you can see the next slide and your notes but the audience just sees the slides. Tip: if you need the comfort blanket of word for word notes (I wouldn't recommend it - it's better to talking points and just talk to them), you can duplicate slides and just change the notes so that you always have view of the exact words you need to say but your audience always see the same slide when you change to the next page for more notes.
If you're doing it "live in a room" try to pick two or three people to talk to directly - moving your focus gives everyone the impression that you're engaging the whole room.
If you're doing it on zoom, practice on the IT you're going to use (ie in a zoom room) so that you know how it works.
This is the one you're not going to like, but it's where the magic is: try to think of it as fun/an exciting thing to do. It's not fear, just misplaced excitement. And if you can, before you go on/up/live, do a wee dance (off camera/in the loo) to give the adrenaline somewhere to go.
Getting comfortable with presenting is totally a learnable skill - you've got this!