This app was made in under 48 hours as a hackathon challenge.
The platform has much to be extended, but for now it shows you what cool meetups or meetup groups are around you or around a city/address you want. It's based on categories and topics, which you can select on the feed page. From there you could also check details on a meetup, as well as details on meetup members.
We used ionic 3, firebase 3 and angularfire2 and the Meetup API.
Video: https://www.useloom.com/share/6da2bd089f1445b290b48478b7752bd4
Project can be accessed at https://meetapp.yannbraga.com/
It is ideal that you access it from your phone, and it also can be added to your home page as the app is also a progressive web app!