When dey c de full moon... Actually it cud b tomorrow or just a day later. But u can certainly go ahead and hav ur BBQ since EID is de time when people enjoi... Der wud b sum people who wud b still fastin cos dey cudnt do so during des days... so, 2 cover up 4 tht, dey go ahead into eid and also days after tht. But, NO problem in BBQ...!!! Hav a gud time...!!!