Media forum works as both a discussion venue and an event format, and both readings have buyers.
As an event, media forums are run by industry associations, press freedom organisations, and broadcasters, usually as senior-level gatherings about the state of the industry. Having the category phrase as the address is a strong position for a recurring event.
As a community, it names a discussion platform for media professionals: journalists, broadcasters, publishers, and the technology people who serve them. Professional communities in media are fragmented across social platforms and private groups, and a dedicated space would find an audience.
The .net suits both. It reads as a network, which is what a forum is, and nobody in this sector types a guessed address.
Two common words, no hyphen, twelve characters, and the phrase is standard in every market that has a media industry.
Offers considered.