I think that as long as you have beverages available - soda, punch, water, etc. - there is no need to even mention the bar. People will figure it out, if they want a drink.
I wouldn't even worry about mentioning that the hors d'oevres will be vegetarian/pescatarian. Again, people will figure it out and eat those items that appeal to them, avoid those that don't.
I would mention the valet parking, though, since some may want to avail themselves of that option.
I'll give it a go:
Please join us from 5:00 to 7:00 pm at X location for a celebration of Mom's life. Light refreshments will be served. Valet parking is available, if you wish, at a cost of $6.
I'm sorry for your loss.