Ah OK like an intro task to get people talking.
When I did ESL classes, one way we would start out would be to mix everyone up by handing out cards which were shuffled and they would have to walk around and find the person (or small group) with their matching card. You wouldn't need the speaking practice as such, but it is beneficial IME to divide people into small groups or pairs, unless the session is very small (under 6 participants). This is because if you want people to speak up and contribute to the discussion and everyone feels self-conscious and doesn't want to be seen to say the wrong thing, it is much less vulnerable for everyone to only speak to their individual neighbour or a small group (max 3-4), and then the pair/group will usually feel more confident to speak up to the group and say "We thought of...." This also works best if they aren't with their best friend they always sit with, and are with a stranger.
So once you've got people in small groups, the most valuable thing to do IME is to try and find out what they already know, as it helps to tailor the content of the rest of the session. A group who knows very little about autism (thinking of rainman, "all on the spectrum" etc) will be mystified if you start going into more complicated things without starting with some basic mythbusting, stats, common difficulties, why it's important to know about autism etc.
OTOH if you happen to have a group who already know a bit about autism and would find the basics or the mythbusting a waste of time, or they all have a lot of experience managing autistic employees and they have really specific questions they want the answers to, then you're going to need much more in depth content than just the basics.
For your slides, then, you could have a sort of planned overlap bit. So for example, start the slides with section A, big basic stuff like myth busting and what autism is/isn't, and a few stats e.g. estimated numbers in the population, plus prevalence in certain industries. Then work through to section B, some common difficulties relating to the workplace specifically, probably the double empathy problem because I think this is so helpful to understand, and ideas for strategies/how to support these difficulties. Then finally section C would be some examples or further detail on any of the strategies or difficulties.
If your group you're teaching have nothing and need to start from scratch, you would cover section A and the easiest, most actionable parts of section B, for the most value, and then run some practice activities where they can try to use the skills they have just learnt about in B and get them to feed back on each other.
If your group don't need the basics then you can skip section A and move straight to section B and C, and run the practice activities and a Q&A session.
If your group already know a lot (I think this is quite rare but it can happen) then run through section B and invite the group to reflect on their experiences or try the practice if any strategies are new. Then have it more as a peer-to-peer support or Q&A.