Follow artist socials, they will promote themselves at gigs. Search for your town name + edm genre on soundcloud, that may tell you the names of regular festivals,events and club nights from the set names. Follow said venue's socials, or regularly check their website for upcoming events.

Figure out who your local promoters are, & follow their socials also.

Go to a youth focused cafe or skate park, look at what event posters are being posted on the walls? Unsure if the kiddies still post bills for small events, honestly everything is on social media these days, and is where you should start once you've identified some names.

In my city, facebook is the most reliable way to discover events - we have very active promoters in the main '$city $genre scene' public fb groups.