Frank pretty much nailed it. In PDGA sanctioned events, there are Majors, National Tours, A tiers, B tiers and C tiers. Generally a C tier is pretty cut and dry tournament, with not a lot of extra added things. Thats not to say a C tier can't have a player pack or added cash.
There is a $10 non member fee if you are not a PDGA member to play in sanctioned events. So if you want to play in the singles on Sunday, you should think about joining- www.pdga.com
For the doubles, it is non PDGA sanctioned so no worries or extra charge for being a non member.