There is a high likelihood that it will still be quite cool with partly cloudy skies, even in early July. While the reception is indoors, you will want to pack a sweater if you'd like to enjoy the outdoor deck and walk around the marina.
There is virtually no public transportation that would make the I-5 commute easier for you. While Ubers do run closer to Seattle, they are not reliable in the South Sound region. It is best to rent a car or double up with other guests on their rental. You can take the Sound Transit 574 bus, however, which runs to and from Lakewood and SeaTac Airport.
Via I-5 N and HWY 16 W, the Waterfront Venue is located thirty-three miles north of St. Michael Parish for a total of forty minutes driving time without heavy traffic.