Keep them coming. I started playing during the Shiho event and I struggled for a bit, but I was still able to pick her up. So far the event units I have seen have not been very appealing to me. As a new player I have picked them up in case I need them some time down the road but have prioritized doing dailies for gold, affection, and DC.

Like others have said, during the week prioritize what's more important for you and on the weekend focus on the event. I hope Nutaku keeps it up. Events give you SC and new characters are fun regardless if they fit into your current team.