Of course it is! ^^
It's an open event and anyone can come if they please.
In fact, events like these are perfect for meeting people.
My first con ever was three years ago and the only people I knew were from my old school except there was this one girl in the group who hated me because I 'stole' her part in a play. (Long story short she was a Junior who got beat out by a Freshman.) So I was pretty alone. I had even called my mom and said that cons weren't what I thought they were and I wanted to go back home. (I live in Washington so I was pretty upset I had driven around 4 hours to get to Portland only to be alone the whole time.) But she was busy so I walked outside and saw a glomp circle. I was watching people play and then another Matt (I was cosplaying Matt from Death Note) said they I should join in. I reluctantly did cause I'm not very outgoing when I don't feel welcome (which I didn't). But I ended up meeting a group of Death Note people. Now most of the people from that group hate me (People just love to hate me for some reason...~<3) but my best friend (FateChooseMe) came from meeting that group of people and joining the glomp circle.
But I think the glomp circle is a bit too violent. I felt terrible for the poor Shino that was there who kept getting attacked by everyone and chased around the park... So I figured this would be much less violent.
Plus, an event like this helped me in realizing that I was welcome at cons because everyone there is just like me and they accept me for who I am. I watched those people make fools of themselves and they still smiled and it made me feel like I belonged there. I want to help others feel the same way and so that friendships can flourish like mine did with Fate. Sure, I made about three enemies in the process but I'd rather have those three people hate me and have gained confidence in myself and a best friend than have left the con and never went to another one.
Oh dear...seems like I've done a little rant. ^^;
I tend to do that sometimes when I feel deeply about something.
TL;DR Everyone is welcome and you will make many friends with us! ^^