All the congregation of Israel shall keep the #passover.
Exodus 12:47

Passover is to be celebrated as an extended family, a community, and as a nation. The one thing it is NOT is an individual, private affair. See also Exodus 12:2-5.

Eating the lamb, which IS the Passover, is a commandment. Although nobody in America can eat a Passover right now, that might change in the Millennial Era, in which case, no strict vegan could be a fully participating member of the Kingdom.