In the memory of Maryam Mirzakhani, I have created maths4maryams.org not as a memorial site, but as a social platform for connecting mathematically like-minded people. Here is what Timothy Gowers says about maths4maryams:
[it is] a website in memory of Maryam Mirzahkani. I don’t mean that it is a memorial website: rather, it has taken an important aspect of her life — her interaction with other like-minded mathematicians at a young age — and aims to facilitate such interactions for others, by the setting up of maths4maryams groups.
In particular, I’ve suggested celebrating the birthday of Maryam (the 12th of May) as Mathematics Friendship Day. I hope you help me (say by popularizing the idea, sharing it on social media, introducing maths4maryams.org to those who might find it useful, etc) to make this dream a reality.