If he is back to his normal self, it is fairly common for owners to wait until regular business hours to come in for a physical examination and discussion on what to do. If he is not back to normal / continuing to have seizures or other neurologic derangements, emergency assessment is warranted. Emergency assessment regardless is always the safest option if available and willing to pursue, when it comes to seizures, although sometimes they are normal by the time they're presented to us.
I would be suggesting starting with some routine labwork - a blood count, serum chemistry panel, and a urinalysis.
Depending on those results, we might monitor, treat with an anti-epileptic drug, and/or pursue other more advanced diagnostics - liver function testing, screening imaging, referral to a neurologist for advanced imaging (MRI, CT) and CSF tap / analysis are all common options.
Indications to start an anti-epileptic medication vary somewhat between veterinarians, but typically it is suggested to treat when cluster seizures occur (multiple siezures in one day, going into a seizure before being recovered from the last one), when seizures last a particularly long time / are particularly severe, or when they are occurring more frequently than every 4-6 weeks. So, often, their may be an initial monitoring period. I've certainl seen dogs presented for seizures than have them once a year or less- these types of cases hardly warrant medicating daily for under the typical current standard of care.
Consider going in on emergency or waiting until business hours if that isn't an option for you, and I'd suggest pursuing at least some basic routine labwork to assess internal organ function, and then discuss from there with your veterinarian what you'd like to do further.
Hopefully this discussion is helpful for you. I'll open it up for rating.