I screwed up

My small community's having a collab with a certain embassy in my country to make an event. Community's chief held an interview for anyone in the group who were interested to be the person in charge. I thought I'd try it out only bcs I wanted to practice doing an English interview AND bcs I thought, surely, since the group has like a few hundreds of members, more people would be interested. Basically, my strategy was to just say I have almost 0 experience (cus I do) and not be chosen.

Only 2 people showed up.
Me and another girl.
When I listened to how well she answered the questions, I was relieved. But then she fricking revealed that she has a 9-5 and is out of town. And there I was...

Now I'm the PIC... Only bcs I can speak a bit of English and that the other person's got a full time job. Idk what struck me but I just said yes. Idk what the fuck I'm doing. I may be in trouble lol.

Also additional info, I'm only a candidate officer for the community. I'm not even official yet, I feel like the chief should've questioned his decision more or sumn.

It's been a few days, I've just confirmed the heads of the divisions and am soon gonna have the first meeting with head of event. I don't know how far I can take this, I'm already stressed out even though we've barely started.