Obviously it is code to have the ability to escape both bedrooms in the event of fire, but could this be mitigated by a sprinkler system or is this effectively a 6 unit apartment building?

You can find more details on the BP event page: https://www.biggerpockets.com/forums/521/topics/676070-central-maine-monthly-investor-meetupThere's always a good mix of new and experienced investors in the room. 

Attended any MeetUps or Conferences?

Read some of Brian Hennessey's books to cover many sections of Commercial assets.Podcasts:Best Ever Real Estate Investing Advice: @Joe FairlessLifetime CashFlow: Rod KhliefApartment Building Investing: Michael BlankReal Estate Investing for CashFlow: Kevin BuppStart attending local commercial associations for brokers and property managers. 

Do I need to register somewhere to attend, or any other details I should know about?

If carbon monoxide detection is not provided, carbon monoxide detectors should be installed to eliminate a potential safety hazard in the event that the gas appliances malfunction and do not function properly.

You can also look up the event section here on Bigger Pockets.Depending on your knowledge and skill level it's always a great idea to continue your learning journey on everything BP has to offer at no cost and then move forward with their awesome guides and books in the links above.You will have a thousand questions on the way and here on BP, you can get more than a thousand answers.

Attend local multifamily meetups (assuming you live in Dallas) and search for, DM, and check out the websites or syndicators and sponsors in Dallas on BP.

I have been attending the webinars, listening to podcasts, and watching youtube.

You can check MeetUp.com for these events or your local REIA.