Provide the theme summaries for the following conversation: 

Elvina: ever been to the local theatre smbd?
Averil: you mean here? The theatre with actors? And stage? Is there any?
Booth: yeah, I was the other day. Pretty cool and cheap.
Elvina: I got invite and dunno what to wear
Booth: I guess nothing much. Its kinda light hearted. Friendly and all. 
Elvina: oh good to know thx
Averil: im seriously shocked they have a theatre here
Booth: i mean it. was rly cool

Summary: 
Elvina needs information about the dress code at the local theatre. Booth has been there before and recommends wearing something casual. Averil is surprised there even is a theatre.