What is the time frame for opening and closing event betting? (i.e., how many days before each regional can you bet)

They are listed on each regional (category) page, and also the detail page.
The detail page has a countdown to these dates, along with the option to receive e-mail notification when these events happen.

In most cases they open about 2 weeks before the event, and close about 2 days before the event.

When will the results from the first weekend be entered?

Since bidding closes tomorrow at 6pm for this weekend's events, I'm waiting until 8pm tonight for FIRST to update their official standings. If they aren't updated by 8pm, I will go looking at the scouting websites (SOAP, WASH, & whatever else I find) and I will use those results to fill in the winning Ventures data.

So tonight, hopefully by 9pm, the winners should get their points.