anyone know any good gambits that could happen often?

I like the Lativan Attack.  It is a gambit and it will happen quite often.

thank you! anyone else?

I like the Hammer gambit, Nimzowitsch Defese with Kennedy variation (B00):

1.e4 Nc6  2.d4 e5  3.dxe5 f6  4.* 

would that happen often?

no