You could.
No, there is not a preposition in there. I is the subject, had is the verb, a pizza party is the object, and today is an adverb.
Pizza party
Not necessarily. The statement only establishes that all students in Mr. Osborne's class like pizza, but it does not specify that liking pizza is a requirement to be in his class. Jeff could still be a student in Mr. Osborne's class, but it is not a definitive conclusion based on the information provided. Additional information would be needed to confirm Jeff's status in Mr. Osborne's class.
Pizza Party - 2010 was released on: USA: 1 December 2010 (Los Angeles, California)
You can only get a pizza ap ron if there is a special party
1st Look - 2008 Pizza Party was released on: USA: 7 December 2013
Bubbling
no
that's not a question dumb as*
From Martha's Kitchen - 2001 Pizza Party with Pino was released on: USA: 21 September 2002
Everyday Italian - 2004 Pizza Party 5-8 was released on: USA: 2005
Marcism - 2013 The Pizza Party 1-6 was released on: USA: 1 February 2014