For context, my entire family is Christian, and we have one godmother who is Muslim but we rarely see. My brother wrote out a whole five page explanation on what exactly he believes in about the Islam, that he found new friends and community and time for prayers, all super nice things. I'm not very aware of my surroundings, so for me it came out of the blue, but apparently it's been in the working for a while. That's great. I love him, I accept him, our sister and mother accept him (which is the immediate family and brutally honest, the ones that matter). This mostly doesn't change anything outside of my crisis of not having noticed anything.
Onto the part where I need help: My brother has a girlfriend of about a yeary she's nice, fully Muslim family, we've officially met her, they almost beam whenever they see each other. Now, my brother has invited us to a dating ceremony that may also be a fiancee ceremony? Since Muslims don't do the vague dating thing, it would technically mean they're fiancees but they're both clear that they're nowhere near ready for actual marriage.
I'll be brutally honest, I couldn't find the name of the ceremony he's talking about and I have no information on it. He said that we just need to attend and other senior Muslims will conduct the ceremony. That's great and all, but I don't know what to expect and what to do or help for.
So, I'm asking you, Islamic part of Reddit, if you have any tips or info on what to do, or what to know? Anything is appreciated.