It’s a gorgeous dress, but I personally wouldn’t wear it to someone else’s wedding unless I’d checked with the bride first.
The issue isn’t that it looks like a bridal gown exactly — it doesn’t — but the base colour is cream, and with the lace detailing it could photograph quite pale/bridal, especially if the bride is wearing ivory or cream rather than bright white.
If you were wearing it to a garden party or races type event, I’d say yes straight away. But for weddings, especially four different ones where you don’t know how relaxed each bride/couple will be, I think it’s a bit too risky.
If you absolutely love it, I’d ask the bride first and style it with very clearly coloured accessories — sage jacket, coloured shoes/bag, no cream or white accessories. But safest answer: beautiful dress, probably not the best choice for a wedding guest.