We are on the Jewel of the Seas out of Amsterdam in July. Some of our excursions return to the ship at or shortly before dinner. (We're early schedule and it says 5:30). On other cruises we've seen the dinner time moved later to accommodate the excursion schedule. If this is not done is it alright to just walk on board and head straight to the MDR and hopefully we're within the 15 minute grace period and have not lost our seats. We would be wearing jeans, etc. whatever was appropriate for the excursion. Thanks much.