You can use the BIT instruction. BIT #$01 would check first bit, BIT #$02 the second, BIT #$04 the third and so on. Following the BIT instruction, you can have a BEQ (result 0, bit not set) or a BNE (result 1, bit set).
As for loading event bit, you can use LDA. This will load either one or two bytes depending if the accumulator is set to 8 or 16 bits. You want the first option.
As for loading event bit, you can use LDA. This will load either one or two bytes depending if the accumulator is set to 8 or 16 bits. You want the first option.