I've done a two parties with 4 ASD kids at each. Each of these kids were very different. One could pin the tail on the donkey with a scarf over eyes, another couldn't (but would shut his eyes and not peak at all).
Group games were tricky. Anything with a queue, we just put ASD kids at the front. Pass the parcel was OK, musical statues not. It varies hugely, so ask the parents.
Cannon ball socks worked well at the pirate party.
Treasure hunt worked well, each kid had a bag and had to run around the garden finding plastic coins, necklaces etc...
'Fishing' for party bags worked well. Get little beach fishing nets on sticks. Get a sheet and paint fish, sea weed etc.. on (or staple paper pictures on). Hold the sheet in front of a door (one adult at each end). Another adult sits behind the sheet with parties bags and other random things in it. The kids take turns to dip the net over the sheet and pull it up to find an old sock, clothes peg, dish cloth etc.. At some point a party bag gets pulled out.
We also had visual time tables by the door of what was happening when. All ASD kids invited had already been to the house before so they'd be comfortable.
When it comes to time to have the food, all the ASD kids had help. We did find they set up there own dining area at the other end of the garden to the rest, but just went with that. We'd set up another quiet spot they chose to ignore. A bit of flexibility helps!
I think if you prepare the kids well, make sure they know what's happening and rules to games you should be OK.