I would suggest you go to the ride meeting place early and feel it out. I wouldn't show up to a road bike event with a fat bike, cargo bike, or for that matter even a MTB. It's got little to do with you or your bike. I'm sure the events in your area are much like everywhere and typically there is an online listing of the event with speed/pace class listing. I would look for: fun runs, recreational rides and scrambles.
I do agree with J.R. that the skinny road tire folks or off road mountain bike riders might wonder why you were there (their loss, not yours). Around Austin, TX there's an opportunity for almost all kinds of riding every weekend and generally a couple of other days each week; your community probably has a lot of similar ride groups, too. Smaller local shops sponsor or post regular rides are a good way to meet and ride with other people and they usually mention the type or pace of ride so you can connect with an appropriate group. Looking forward to hearing about your adventures!
I find most other bicycle riders are indifferent about the bike I'm riding at the moment. A year ago I had a group of older fellas call me a cheater, but none since. Hindsight tells me it was done in jest, insecurity or just pure ignorance of the subject. As a matter of fact, this year I've ridden more than ever with non-e riders and I find 99% of them fall into one of three categories; indifference, curious or enthusiastic. The attitude that 'they all hate us', is just not productive in my estimation. Had it not been for the support and activism on the part of cycling groups in Pennsylvania, ebikes would still be illegal, as they were prior to 2014. I would bet that's true for most of the world. Last, but not least, as a lifelong Harley rider, I can say with certainty the vast majority of riders are spending ZERO time on the subject.
P.S. I like the phrase "Cheater", great way to meet other ebikers
