Trans women get a lot of representation as trans people, but not enough as women, particularly in feminist and lesbian spaces. You could talk about how despite being men, trans men are often included in lesbian spaces, where trans women aren't.
I feel that the presence of trans women in the media isn't always positive - that the reason that there's more trans feminine people on tv is that society is more interested in what amab people do - which is lowkey misgendering and liked to femmephobia and toxic masculinity. Some people respond more to afab people being 'strong' or 'not like other girls' but for amab people to be feminine is seen as more negative, trans or cis.
It seems like it's less unusual for afab people to wear masculine clothes (jeans, hoodies, unfitted t-shirts...) than it is for amab people to wear heels, skirts etc, and while logically the idea that skirts represent women is nonsense, society's reaction to trans women often displays how ingrained the association is.
You could also talk about how some trans men internalize misogyny to the extent that they don't believe that feminism is necessary at all.
Also I feel that while I have the experience of being perceived as female, I haven't experienced being female, because I'm not. For example, I don't want my chest, or to see it or to have anyone see it, so I don't know what it's like to want to go topless as a female and be unable to, or to be punished for trying to breast feed in public, etc. However I do know about how badly bras are designed and how women's clothes rarely have pockets, what it's like to feel under threat from the male gaze, etc.
Could you invite a trans woman to join your talk? You could compare the experience of gaining versus loosing male privilege. I don't know if i would do a talk/attend a specifically feminist event unless it was intended to be mixed gender wise (ie trans men weren't the only men there) and unless i could be sure it wasn't an unintentional misgendering, and unless i knew there'd be trans women there too.
Sorry this is vague - this is another reason why I wouldn't want to be the one to try talk about it! I hope i gave you some ideas though