The phrase "a forum with" is perfectly correct and usable in written English.
For example, you could use it in a sentence such as: "I found a great forum with lots of interesting discussion topics."
The site also has a forum with many thousands of posts.
"We're from the same camp," he said Monday at a forum with recent high school graduates.
So we propose to assemble a forum, with participation from civil society organisations, the private sector and government departments.
Mr. Perry had been in South Carolina, where he was scheduled to take part in a forum with his Republican rivals.
An awards ceremony will take place on November 15 at Harvard Graduate School of Design, with a forum with the winners and expert panel discussions the following day.
The administrative capitals had regular street grids, a forum with basilica (public hall), public baths, and temples; a few had theatres and amphitheatres, too.
He had visited a small restaurant for a town forum with a group of veterans.
To date the Commission has held one public hearing with witnesses and then a forum recently with professors and academicians.
So there will be a large forum with a video wall.
Anonymous was born out of the influential internet messageboard 4chan, a forum popular with hackers and gamers, in 2003.
Friday's rampage was praised on a forum associated with Islamic State.
