Yes, you can, but you lose the time pattern of revisions. 

AMC M.A.901(c)2, (e)2 and (f): 

It is acceptable to anticipate the extension of the ARC for a maximum of 30 days without loss of the temporary standard of revisions of the certificate of airworthiness, which means that the new expiry date would be set one year after the previous expiry date. 

No, it is not possible to issue either an ARC or a recommendation with open incidents. 
Each incident requires at least one corrective action before issuing an ARC or recommendation. Corrective actions should be appropriate for open incidence.  
Corrective actions should be carried out and airworthiness review staff (PRA) must accept the closure of incidents prior to the issuance or recommendation of the ARC.