I'd like to make a Nostr based Meetup.com alternative that is map based. 

The general idea is you would travel a greater distance to attend an event you cared more about.

Someone would propose an idea for an event (could be a one-off event, or a recurring series more similar to a meetup group) in a general area, and you would respond by showing what area of the map you would consider attending said event. 

The proposer of the event would receive back a heat map showing geographical areas that if the event were to happen there, how many people would be interested. The responding areas would need to have at least some overlap with the original proposer's area. 

Once a sufficient number of people were interested, a private group message could be used to schedule the event among those interested.

For notifications, users would draw areas to indicate when they wanted to be alerted of new events containing certain keywords. 

Perhaps I draw one shape to indicate an area I'd like to be alerted of any events containing the word SURFING, and another shape on the map to indicate the area I'd like to be alerted of any event that contains the word BITCOIN. 

The thought is this method would both indicate relative interest (size of the shape on the map, and number of respondents) while also helping pick a location for events to be organized. 

For privacy, you could be overly large with the areas you draw, and not center them around your home town. The general premise should still work. 

It seems like a fun way to get people to gather over common interests.