Is AUTHOR wrong in the post ? POST : Hi guys, I am a lurker here from a couple of months and I would have never thought of writing here. Long story coming.

I have a GF, both of us are 25 yo, usually we see each other 3 evenings during the week, saturday evening we sleep together and all the day during the Sunday.  She basically does not have any interest other than seeing me and she see her friends very rarely, like maybe once every month or 2 because at least one of them always something else to do. I took up again MTG the card game a year ago. I played at first with a friend of mine casually then contacted other 2 old friends that also played and we started to do it more "seriously". I am not traveling to do the world championship or anything but if there is an event nearby we sometimes (rarely actually) think to attend it. We actually did 2 times.

Now the thing is that I work Monday-saturday. His event are at Sunday. There other 2 times that I played my GF made me clear that she was upset because she want to spend the Sunday together. 
In fact the first time we started in a small shop and the event ended  at 14.00, at that point I hate an hamburger and went straight to her.
The second time it was a bigger event so i was eliminated around 17.30/18 at that point once again I went to her (she was with her family) and spent the rest of the evening with her family and then alone with her.

Now I want to participate at another event like this and I took the saturday off work to stay with her to "compensate". Now she is super mad that I want to participate, she says that I should spend every Sunday with her, that if I go I won't be one of her priority anymore. 
She says that I already see them one evening every week so that should be enough and I should spend the rest of the time with her. 
I tried to like meet each other in a middle ground like I will do this only once every 2 months at max, I will ask more saturday off work to spend some weekend just with her somewhere. 
Nothing she was super mad, started to cry saying that she might agree to something like 2 events per year and that it was still too much. 

Am I the asshole for wanting to participate at this events with my friend leaving her alone?