Does anyone know if you can enter the master and adult division at IBJJF tournaments?
yeah you have to pay separate registration fees for each division iirc.
No...you are only allowed to enter one or the either...you can either do master or adult..but not both.
Alvis
www.solismartialarts.com
The masters&seniors and the rio open are collocated events, so you can do both that way.
JSho is correct only in Rio here,its still one division.
You old fogey!! 
Ha! Fuck it I'll just do the adult division. Thanks for the info guys