Thanks for the info.
In the past, I've tried going to Ren Fairs and music festivals to meet new people, but found that everyone just stuck to their established cliques and didn't get an opportunity to meet anyone.
You could try to find online groups for the local Ren Faires and music fests, to meet people who go regularly and start to make contacts ahead of time, so you'll have a built-in group to attend with.
I am the kind of person who struggles at approaching strangers when there is not some kind of eternal icebreaker in play. I've also had the same experience when I've occasionally went to a coffee shop or bar.
I know it's harder when you're an introvert. I think it's key to go out often, to a few places where you like the ambiance or focus. It's quite OK to just observe for a while! Eventually you'll get to recognize people and they will recognize you. Finally, you might feel brave enough to strike up a conversation with people, couples, families or whatever. Look open and interested, smile a lot, make some eye contact (not in a creepy way) and maybe someone will start talking to you. It's OK to just make platonic friends too. Don't expect to meet a sex partner right away.
Figure out a list of icebreaker comments or questions, about the venue, the members of the band, or ask about someone's outfit (Where'd you get that tshirt, hat, etc.?).
There are DJ parties around too. I have one friend who goes to those all the time. She's very outgoing, often works the door or manages the event in other ways, and will talk to anyone who seems friendly. If you meet someone like that, she or he will help with introductions.
You might need to invest some money and time into traveling to a bigger city where more progressive type people live. Even in red states, the bigger cities will have more alternative people. Fetlife is a site for kinksters, but poly people also go there to connect, and you can find events that way. Feeld is a newer dating app that is quite open to poly people (and LGBTQ, etc.)
The one time I found info online about a sex party, it was invite only and no single men are allowed. When I tried websites like benaughty, my area women in my area were scarce. I either not a lot of people on traditional dating sites are interested or they are not comfortable disclosing.
The thing is, polyamory is not about sex. Swinging is about sex, without love. Polyamory means many loves. Romance is involved, and usually sex is (except for asexuals), but it's not the first focus.
I talked to my current bf (of 20 months) online, on Fetlife, for 3 years, just as friends, before and during the pandemic, before we finally met and realized we had great chemistry, besides the similar other interests we'd discussed. I've dated many men since 2008, and I've had r'ships that lasted from 3 months to 2.5 years, but this one seems to have great longevity potential. Dating takes time and effort, so try and be patient. (I got lucky with my gf though, I met her just 3 months after separating from my husband and ending our monogamous relationship. And here we are 14 years later. So, you never know!)
I don't know much else. I've found just enough info, mostly on social media, to know that people are out. People don't openly volunteer that they are polyamorous around here. The only woman I've met who did tell me she's polygamous turned out to be an extremely toxic individual. I knew someone in the past who liked to have threesomes with her husband, but didn't permit him to have sex with other women when she wasn't present. But I can't think of anyone I else I know is polyamorous or in an open relationship.
You'll find out more as you start to research and find better resources and learn how to be a bit more outgoing, I promise!