vB3 and vB4 had an events calendar that users could post to and which would allow you to pull up upcoming events below your forum. There isn't one in vB5 and presently there doesn't seem to be any plan for one.
I developed a calendar for my vb5 site. Had it up and running for 3 months and not a single person besides me used it. I scrapped the rest of my planned development since nobody was interested. I bought a PHP calendar class license and developed off of that. It wasn't difficult to do and the code integration took about 12 hours to write and debug. After it was up and running, adding features was pretty simple.
I just dicovered that vb5 does have some event api and still has the event table. I haven't played with it yet, but I'm thinking about resurrecting my calendar mod.